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WO2025174795A1 - Alliages à mémoire de forme, procédés de fabrication et procédés d'utilisation - Google Patents

Alliages à mémoire de forme, procédés de fabrication et procédés d'utilisation

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Publication number
WO2025174795A1
WO2025174795A1 PCT/US2025/015465 US2025015465W WO2025174795A1 WO 2025174795 A1 WO2025174795 A1 WO 2025174795A1 US 2025015465 W US2025015465 W US 2025015465W WO 2025174795 A1 WO2025174795 A1 WO 2025174795A1
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WIPO (PCT)
Prior art keywords
shape memory
based alloy
memory metallic
metallic alloy
alloy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/US2025/015465
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English (en)
Inventor
Peng Jiang
Belal BATWA
Zhongyu XIE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Florida
University of Florida Research Foundation Inc
Original Assignee
University of Florida
University of Florida Research Foundation Inc
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Filing date
Publication date
Application filed by University of Florida, University of Florida Research Foundation Inc filed Critical University of Florida
Publication of WO2025174795A1 publication Critical patent/WO2025174795A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon

Definitions

  • SMAs Shape memory alloys
  • the shape memory effect (SME) refers to an SMA that de-twins when mechanically deformed in the lower symmetry phase. Upon heating, the lower symmetry phase transforms to a higher symmetry phase recovering the accumulated strain. Furthermore, if internal stresses bias the reverse transformation during cooling back to the lower symmetry phase, then strains can also be associated with this reverse transformation, a phenomenon called the two-way shape memory effect (TWSME).
  • the large strain recovery (e.g., 8%) associated with the SME in these alloys can occur against large stresses (e.g., 500 MPa), resulting in their use as actuators.
  • large stresses e.g., 500 MPa
  • SE superelastic effect
  • strains of up to 8% are generated during the stress-induced transformation of the higher symmetry phase to the lower symmetry phase.
  • the strain recovers during the reverse transformation to the higher symmetry phase.
  • the present disclosure provides for a material, comprising: a shape memory metallic alloy structure, wherein the shape memory metallic alloy structure has a first state and a second state, wherein in the first state the shape memory metallic alloy structure has a first side having a surface grating with a periodic nanostructure or microstructure pattern, wherein in the first state the shape memory metallic alloy structure is in a first crystalline phase, wherein in the second state the shape memory metallic alloy structure has a substantially smooth or smooth surface, wherein in the second state the shape memory metallic alloy structure is in a second crystalline phase, wherein the shape memory metallic alloy structure has the characteristic of changing from the first crystalline phase of the first state to the second crystalline phase of the second state by increasing the temperature of the shape memory metallic alloy structure to a transition temperature of the shape memory metallic alloy or higher, wherein the shape memory metallic alloy structure has the characteristic of changing from the second crystalline phase of the second state to the first crystalline phase of the first state by decreasing the temperature of the shape memory metallic alloy structure to
  • the present disclosure provides for a method of making the material as described above or herein, comprising: disposing a monolayer of particles on a first substrate, wherein the particles form a periodic particle pattern; disposing of a shape memory metallic alloy on a side of the monolayer of particles that is opposite the first structure to form a shape memory metallic alloy structure, wherein the monolayer of particles is between the first substrate and the shape memory metallic alloy structure, wherein the shape memory metallic alloy structure has a surface grating with periodic nanostructure or microstructure pattern.
  • Figures 1A-1F illustrates the typical programming and recovery cycle of a NiTi SMA sheet.
  • Photos of a NiTi SMA sheet at original flat status Figure 1A
  • the same NiTi sample after mechanical indentation Figure 1B
  • the SMA sheet after thermal recovery Figure 1C
  • SEM images of the original flat SMA sheet Figure 1D
  • mechanically indented state Figure 1E
  • thermally recovered state Figure 1F
  • Figures 2A-2D illustrate the sputtered NiTi SMA film on a self-assembled monolayer silica colloidal crystal.
  • Photo of a sputtered NiTi film on 1 ⁇ m silica particles (Figure 2A), SEM images of the sputtered film at 90° view angle (Figure 2B), bottom view (Figure 2C), and top view ( Figure 2D).
  • Figures 3A and 3B illustrates normal-incidence optical reflection measurements of a NiTi SMA sheet before indentation, after indented with circular dimples of 510 nm depth, and after thermal recovery in the visible (Figure 3A) and NIR range (Figure 3B).
  • Figures 4A and4B illustrate normal-incidence optical reflection measurements of sputtered NiTi SMA film on 1 ⁇ m silica colloidal crystal film in the visible (Figure 4A) and NIR range (Figure 4B).
  • Figures 5A and 5B illustrate X-ray diffraction spectra show characteristic diffraction peaks for NiTi alloy sheet ( Figure 5A) and sputtered NiTi film ( Figure 5B).
  • DETAILED DESCIPTION The present disclosure provides for shape memory alloy structures having one-way shape memory characteristics, methods of making periodic shape memory alloy nanostructures, and methods of use.
  • Standard temperature and pressure are defined as 25 °C and 1 atmosphere.
  • Embodiments of the present disclosure provide for shape memory alloy structures having one-way shape memory characteristics, methods of making periodic shape memory alloy nanostructures, and methods of use.
  • the shape memory alloy structures of the present disclosure can reversibly change shape and/or coloration based upon interaction with stimuli or exposed to stimuli, such as temperature.
  • An advantage of an embodiment of the present disclosure is that the shape memory alloy nanostructures are simple to make, scalable, and inexpensive.
  • Shape memory alloys are a class of "smart" materials that can memorize and recover their permanent shapes in response to an external stimulus, such as temperature change (e.g., heat), light, solvent, electricity, and magnetic fields.
  • the shape memory alloy structures have shape memory characteristics and tunable light diffraction properties.
  • the diffraction properties can be selected based on the periodic particle pattern (e.g., periodic nanostructure or microstructure pattern) of the shape memory alloy structure.
  • the shape memory alloy structure has a periodic particle pattern (e.g., visually this can be iridescent) and in another state the shape memory alloy structure does not have the periodic particle pattern (e.g., visually a dull metallic color and is not iridescent), where the shape memory alloy structure has the characteristic to change between states by changing the temperature of the shape memory alloy structure (e.g., above or below the Martensite TH Docket No.222112-2370 temperature of the shape memory alloy).
  • embodiments of the present disclosure provide shape memory alloy structures that have thermoresponsive one-way shape memory effect (OWSME) and superelastic effect (SE) properties.
  • OWSME thermoresponsive one-way shape memory effect
  • SE superelastic effect
  • the present disclosure provides for a material that includes a shape memory metallic alloy structure.
  • the shape memory metallic alloy structure has a first side having a surface grating with a periodic nanostructure or microstructure pattern.
  • the first state of the shape memory metallic alloy structure has a first crystalline phase (e.g., a Martensite crystalline phase for nickel- titanium based alloy).
  • the second state of the shape memory metallic alloy structure has a substantially smooth or smooth surface (e.g., without the periodic nanostructure or microstructure pattern or substantially (e.g., about 85% or more, about 90% or more, about 95% or more) without the periodic nanostructure or microstructure pattern).
  • the second state of the shape memory metallic alloy structure has a second crystalline phase (e.g., an Austenite crystalline phase for nickel-titanium based alloy).
  • the shape memory metallic alloy structure has the characteristic of changing from the first crystalline phase of the first state to the second crystalline phase of the second state by increasing the temperature of the shape memory metallic alloy structure to a transition temperature (e.g., Martensite temperature for nickel- titanium based alloy (e.g., about 40° C for a specific alloy sample) of the shape memory metallic alloy or higher.
  • a transition temperature e.g., Martensite temperature for nickel- titanium based alloy (e.g., about 40° C for a specific alloy sample) of the shape memory metallic alloy or higher.
  • the shape memory metallic alloy structure is made of NiTi
  • the TH Docket No.222112-2370 shape memory metallic alloy structure has the characteristic of changing from the Martensite crystalline phase of the first state to the Austenite crystalline phase of the second state by increasing the temperature of the shape memory metallic alloy structure to the Martensite temperature (e.g., 40° C) of the shape memory metallic alloy or higher.
  • the shape memory metallic alloy is a nickel-titanium based alloy and the change from a first state to a second state is based on the ability of nickel-titanium based alloy (e.g., Nitinol) to transform from a higher temperature crystal structure (Austinite crystalline phase) to a different lower temperature crystal structure (Martensite crystalline phase), where the transition temperature (e.g., Martensite temperature) is about 40° C or 40° C.
  • nickel-titanium based alloy e.g., Nitinol
  • the transition temperature e.g., Martensite temperature
  • the shape memory metallic alloy structure has the characteristic of changing from the Martensite crystalline phase of the first state to the Austenite crystalline phase of the second state by increasing the temperature of the shape memory metallic alloy structure to about 40° C or higher, 40° C or higher, higher than 40° C, or higher than 41° C.
  • the shape memory metallic alloy structure has the characteristic of changing from the Austenite crystalline phase of the second state to the Martensite crystalline phase of the first state by decreasing the temperature of the shape memory metallic alloy structure to about 40° C or lower, 40° C or lower, lower than 40° C, or 39° C or lower.
  • a distance across the hemispherical three-dimensional impression at the top (e.g., the original planar surface of the structure) of the hemispherical three-dimensional impression can be about 100 nm to 100 ⁇ m, about 100 nm to 2 ⁇ m, about 500 nm to 1 ⁇ m, about 500 nm to 4 ⁇ m, about 1 ⁇ m to 100 ⁇ m, or about 2 ⁇ m to 100 ⁇ m.
  • a depth of the hemispherical three-dimensional impression can be about 20 nm to 40 ⁇ m, about 100 nm to 40 ⁇ m, about 100 nm to 2 ⁇ m, about 500 nm to 1 ⁇ m, about 500 nm to 40 ⁇ m, about 1 ⁇ m to 40 ⁇ m, or about 2 ⁇ m to 40 ⁇ m.
  • the present disclosure provides for methods of making the shape memory metallic alloy structure.
  • the method includes disposing a monolayer of particles (e.g., silica nanoparticle and/or microparticles) on a first substrate. The particles form a periodic particle pattern.
  • the method includes disposing of a shape memory metallic alloy structure on a side of the monolayer of particles that is opposite the first structure.
  • the monolayer of particles is between the first substrate and the shape memory metallic alloy structure.
  • the method then includes disposing a second substrate on the shape memory metallic alloy structure on the side opposite the monolayer of particles to form a sandwich structure.
  • a pressure is applied upon the sandwich structure sufficient to form a surface grating with periodic nanostructure or microstructure pattern into the shape memory metallic alloy structure.
  • the pressure can be applied using a press.
  • the pressure can be about 1 lb force to 20,000 lb force.
  • the first substrate and the second substate can be glass substrates (e.g., glass slides).
  • the first substrate and the second substate can be formed of other materials such as metal, metal oxide, semiconductor, and the like, where the material can withstand the pressure applied to the sandwich structure.
  • the shape memory metallic alloy structure can have dimensions as described above.
  • the shape memory metallic alloy structure can be made of a shape memory metallic alloy as described above.
  • the surface grating with periodic nanostructure or microstructure pattern can include a plurality of hemispherical three-dimensional impressions in the shape memory metallic alloy such as described above and herein.
  • the particles can be nanoparticles or microparticles.
  • the particle can be made of a material such as a silica nanoparticle, a polymer latex particle, a titania particle, a zirconia particle, an alumina particle, a gold particle, an iron oxide particle, or a CdSe particle.
  • the particles can have a uniform diameter or a mix of diameters, where the mix of diameters can form a periodic particle pattern.
  • the particles can have a diameter of about 50 nm to 100 ⁇ m, about 500 nm to 4 ⁇ m, about 500 nm to 3 ⁇ m, about 500 nm to 2 ⁇ m, about 200 nm to 1000 nm, or about 200 to 500 nm.
  • the particles can be silica particles.
  • the monodispersed silica particles can be synthesized by the standard Stöber method or other appropriate method. Silica particles are self-assembled on a substrate such as a glass microslide. Other monodispersed particles, such as polystyrene and poly(methyl methacrylate) (PMMA) particles, can also be used. Silica particles can be dispersed in an alcohol such as ethanol, can be assembled on the glass slides.
  • the silica nanoparticle monolayers can be created by a variety of methods, for example, a simple and scalable Langmuir-Blodgett (LB) method.
  • the present disclosure provides for a method of making the shape memory metallic alloy structure that includes disposing a monolayer of particles on a first substrate. The particles form a periodic particle pattern.
  • the method provides for disposing a shape memory metallic alloy on a side of the monolayer of particles that is opposite the first structure to form a shape memory metallic alloy structure.
  • the monolayer of particles is between the first substrate and the shape memory metallic alloy structure.
  • the shape memory metallic alloy structure has a surface grating with periodic nanostructure or microstructure pattern, such as that described herein.
  • the first substrate is a glass substrate or made of another material as described herein.
  • the shape memory metallic alloy structure can be made of a shape memory metallic alloy as described herein.
  • the shape memory metallic alloy structure can have dimensions as described above.
  • the shape memory metallic alloy structure can be made of shape memory metallic alloys as described above.
  • the surface grating with periodic nanostructure or microstructure pattern can include a plurality of hemispherical three-dimensional impressions in the shape memory metallic alloy such as described above and herein.
  • the particles can be nanoparticles or microparticles as described above and herein.
  • the distance between at least two pairs of adjacent particles (or hemispherical three-dimensional impressions) can be substantially the same (e.g., about 100 nm to 1000 nm).
  • the number of unique pairs can be about 10, 100, 1000, 10,000, 100,000, 1,000,000, 100,000,000, 100,000,000, to about 10, 100, 1000, 10,000, 100,000, 1,000,000, 100,000,000, 100,000,000, 1 x 10 10 , 1 x 10 12 , 1 x 10 15 , 1 x 10 17 , or 1 x 10 20 and any set of ranges (e.g., about 10,000 to 100,000, about 100 to 1 x 10 10 , etc.) within these numbers or subranges (e.g., about 15 to 200,000, 2,500,000 to 3 x 10 12 , etc.) within these numbers.
  • the distance between each pair of adjacent particles (or hemispherical three-dimensional impressions) is substantially the same. In an embodiment, the distance between a portion of the pairs of adjacent particles (or hemispherical three- dimensional impressions) is substantially the same. In an embodiment, the “portion” can be about 50% or more, about 60% or more, about 70% or more, about 80% or more, about 90% or more, about 99% or more, or about 100%, over a defined area of the substrate (e.g., shape memory metallic alloy structure).
  • the defined area can include about 50% or more, about 60% or more, about 70% or more, about 80% or more, about 90% or more, about 95% or more, about 99% or more, or about 100%, of the area of the substrate (e.g., shape memory metallic alloy structure).
  • the term “substantially” in these contexts can mean about 50% or more, about 60% or more, about 70% or more, about 80% or more, about 90% or more, about 99% or more, or about 100%.
  • adjacent refers to two particles (or hemispherical three-dimensional impressions) next to one another without a particle (or hemispherical three-dimensional impressions) separating them in the same substrate (e.g., shape memory metallic alloy structure).
  • a polymer framework separates the particles (or hemispherical three-dimensional impressions).
  • the diameter (or longest distance across the void) of all or substantially all of the particles (or hemispherical three-dimensional impressions) can be substantially equivalent.
  • the term “substantially” in this context can mean about 50% or more, about 60% or more, about 70% or more, about 80% or more, about 90% or more, about 99% or more, or about 100%.
  • a material comprising: a shape memory metallic alloy structure, wherein the shape memory metallic alloy structure has a first state and a second state, wherein in the first state the shape memory metallic alloy structure has a first side having a surface grating with a TH Docket No.222112-2370 periodic nanostructure or microstructure pattern, wherein in the first state the shape memory metallic alloy structure is in a first crystalline phase, wherein in the second state the shape memory metallic alloy structure has a substantially smooth or smooth surface, wherein in the second state the shape memory metallic alloy structure is in a second crystalline phase, wherein the shape memory metallic alloy structure has the characteristic of changing from the first crystalline phase of the first state to the second crystalline phase of the second state by increasing the temperature of the shape memory metallic alloy structure to a transition temperature of the shape memory metallic alloy or higher, wherein the shape memory metallic alloy structure has the characteristic of changing from the second crystalline phase of the second state to the first crystalline phase of the first state by decreasing the temperature of the shape memory metallic alloy structure to the transition temperature of the shape memory metallic alloy or
  • Feature 2 The material of any of the features described above or herein, wherein in the first state, the shape memory metallic alloy structure is iridescent, wherein in the second state, the shape memory metallic alloy structure is not iridescent.
  • Feature 3 The material of any of the features described above or herein, wherein the shape memory metallic alloy is selected from the group consisting of: nickel-titanium based alloy, indium-titanium based alloy, nickel-aluminum based alloy, nickel-gallium based alloy, copper based alloy, gold-cadmium based alloy, iron-platinum based alloy, iron-palladium based alloy, silver-cadmium based alloy, indium-cadmium based alloy, manganese-copper based alloy, ruthenium-niobium based alloy, ruthenium-tantalum based alloy, titanium based alloy, and iron-based alloy.
  • Feature 4 The material of any of the features described above or herein, wherein the surface grating with periodic nanostructure or microstructure pattern is formed by indentions from nanoparticles or microparticles, wherein the nanoparticles or microparticles have a uniform diameter, wherein the diameter is about 100 nm to 100 ⁇ m.
  • Feature 5 The material of any of the features described above or herein, wherein the surface grating with periodic nanostructure or microstructure pattern is formed by indentions from nanoparticles or microparticles, wherein the nanoparticles or microparticles have a uniform diameter, wherein the diameter is about 100 nm to 100 ⁇ m.
  • Feature 5 The material of any of the features described above or herein, wherein the surface grating with periodic nanostructure or microstructure pattern is formed by indentions from nanoparticles or microparticles, wherein the nanoparticles or microparticles have a uniform diameter, wherein the diameter is about 100 nm to 100 ⁇ m.
  • the first substrate and the second substate is glass, silicon or glass/silicon substrate.
  • the shape memory metallic alloy structure is made of a shape memory metallic alloy selected from is selected from the group consisting of: nickel-titanium based alloy, indium-titanium based alloy, nickel-aluminum based alloy, nickel- gallium based alloy, copper based alloy, gold-cadmium based alloy, iron-platinum based alloy, iron-palladium based alloy, silver-cadmium based alloy, indium-cadmium based alloy, manganese-copper based alloy, ruthenium-niobium based alloy, ruthenium-tantalum based alloy, titanium based alloy, and iron-based alloy.
  • Feature 12 The method of any of the features described above or herein, wherein the surface grating with periodic nanostructure or microstructure pattern is formed by indentions from nanoparticles or microparticles, wherein the nanoparticles or microparticles have a uniform diameter, wherein the diameter is about 100 nm to 100 ⁇ m.
  • Feature 13 The method of any of the features described above or herein, wherein the surface grating with periodic nanostructure or microstructure pattern is formed by indentions from nanoparticles or microparticles, wherein the nanoparticles or microparticles have a uniform diameter, wherein the diameter is about 100 nm to 100 ⁇ m.
  • Feature 13 The method of any of the features described above or herein, wherein the surface grating with periodic nanostructure or microstructure pattern is formed by indentions from nanoparticles or microparticles, wherein the nanoparticles or microparticles have a uniform diameter, wherein the diameter is about 100 nm to 100 ⁇ m.
  • the surface grating with periodic nanostructure or microstructure pattern is a plurality of hemispherical three dimensional impressions in the shape memory metallic alloy, wherein a TH Docket No.222112-2370 distance between pairs of the hemispherical three dimensional impressions in a group of the hemispherical three dimensional impressions is substantially the same, wherein a distance across the hemispherical three dimensional impression at the top of the hemispherical three dimensional impression is about 100 nm to 100 ⁇ m, wherein a depth of the hemispherical three dimensional impression is about 20 to 20 ⁇ m.
  • particle is selected from a silica nanoparticle, a polymer latex particle, a titania particle, a zirconia particle, an alumina particle, a gold particle, an iron oxide particle, a CdSe particle, optionally wherein the particles where the type selected has a uniform diameter, optionally wherein the diameter of the particle is about 100 nm to 100 ⁇ m.
  • Feature 16 A method of making the material as described above or herein, comprising: disposing a monolayer of particles on a first substrate, wherein the particles form a periodic particle pattern; disposing of a shape memory metallic alloy on a side of the monolayer of particles that is opposite the first structure to form a shape memory metallic alloy structure, wherein the monolayer of particles is between the first substrate and the shape memory metallic alloy structure, wherein the shape memory metallic alloy structure has a surface grating with periodic nanostructure or microstructure pattern.
  • Feature 17 The method of any of the features described above or herein, wherein the first substrate is a glass substrate.
  • Feature 18 A method of making the material as described above or herein, comprising: disposing a monolayer of particles on a first substrate, wherein the particles form a periodic particle pattern; disposing of a shape memory metallic alloy on a side of the monolayer of particles that is opposite the first structure to form a shape memory metallic alloy structure, wherein the monolayer of particles is between the first substrate and the shape memory metallic alloy structure, where
  • particle is selected from a silica nanoparticle, a polymer latex particle, a titania particle, a zirconia particle, an alumina particle, a gold particle, an iron oxide particle, a CdSe particle, optionally wherein the particles where the type selected has a uniform diameter, optionally wherein the diameter of the particle is about 100 nm to 100 ⁇ m.
  • the template was made by using the simple Langmuir-Blodgett (LB) coating method, 2 and consisted of hexagonally closed-packed silica microspheres with different diameters ranging from 200 nm to 4 micrometers.
  • a sandwich structure was constructed by placing a smooth NiTi SMA sheet between two glass slides with monolayer silica colloidal crystals covering their surfaces.
  • the TH Docket No.222112-2370 sandwich structure was subsequently inserted into a manual hydraulic press (Carver Model C). The sample was then compressed with a force of 10,000 pounds to imprint the hemispherical shapes of the silica particles onto the surfaces of the NiTi sheet. After removing the sample from the hydraulic press, some silica particles may adhere on the SMA sheet.
  • the first method involves soaking the sample in a 1 vol.% hydrofluoric acid solution for ⁇ 1 min; while the second technique is based on wiping the particles away with wet cotton Qtips.
  • the attached particles can be easily removed due to the low adhesion between NiTi and silica particles.
  • it is necessary to heat it above its Martensite temperature of ⁇ 40°C.
  • the NiTi sample is placed on a Fisher Scientific Isotemp RT digital hot plate at 60°C. It only takes 10 to 15 s for the NiTi SMA alloy to recover from the Martensite phase to the Austenite phase and return to a flat surface.
  • Figures 1A-1F illustrate typical photographs and scanning electron microscope (SEM) images of a NiTi SMA sheet during a mechanical indentation and thermal recovery cycle.
  • the original metallically shining sheet (Figure 1A) with smooth surface (Figure 1D) transforms into an iridescent film (Figure 1B) caused by visible light diffraction from the indented surface gratings ( Figure 1E).
  • Figure 1C the iridescent color disappears ( Figure 1C) due to the recovery of the original flat surface state ( Figure 1F).
  • the sputtered SMA coating forms conformal layer on the ordered silica particles.
  • the hexagonal ordering maintains at both the top and bottom surfaces of the sputtered film.
  • the stimuli-responsive SPR properties of the nanostructured SMA films 10 were investigated by measuring normal-incidence specular optical reflection spectra with high- resolution Vis-NIR (HR4000, Ocean Optics) and NIR (NIR-512, Ocean Optics) spectrometers.
  • a tungsten halogen lamp (LS-1, Ocean Optics) and a halogen lamp (DH-2000, Mikropack) were used as the light sources.
  • a concentration range of “about 0.1% to about 5%” should be interpreted to include not only the explicitly recited concentration of about 0.1 % to about 5 %, but also include individual concentrations (e.g., 1%, 2%, 3%, and 4%) and the sub-ranges (e.g., 0.5%, 1.1%, 2.2%, 3.3%, and 4.4%) within the indicated range.
  • the term “about” can include traditional rounding according to significant figure of the numerical value.
  • the phrase “about ‘x’ to ‘y’” includes “about ‘x’ to about ‘y’”. Unless defined otherwise, all technical and scientific terms used have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Micromachines (AREA)

Abstract

La présente invention concerne des structures d'alliage à mémoire de forme ayant des caractéristiques de mémoire de forme unidirectionnelle, des procédés de fabrication de nanostructures d'alliage à mémoire de forme périodique, et des procédés d'utilisation. Les structures d'alliage à mémoire de forme de la présente invention peuvent changer de forme et/ou de coloration de manière réversible sur la base d'une interaction avec des stimuli ou exposées à des stimuli, tels que la température.
PCT/US2025/015465 2024-02-12 2025-02-12 Alliages à mémoire de forme, procédés de fabrication et procédés d'utilisation Pending WO2025174795A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040014253A1 (en) * 2002-07-17 2004-01-22 Vikas Gupta Three dimensional thin film devices and methods of fabrication
US20070282247A1 (en) * 2003-05-05 2007-12-06 Nanosys, Inc. Medical Device Applications of Nanostructured Surfaces
US20090047197A1 (en) * 2007-08-16 2009-02-19 Gm Global Technology Operations, Inc. Active material based bodies for varying surface texture and frictional force levels
US20140026554A1 (en) * 2012-07-27 2014-01-30 GM Global Technology Operations LLC Superelastic shape memory alloy overloading and overheating protection mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040014253A1 (en) * 2002-07-17 2004-01-22 Vikas Gupta Three dimensional thin film devices and methods of fabrication
US20070282247A1 (en) * 2003-05-05 2007-12-06 Nanosys, Inc. Medical Device Applications of Nanostructured Surfaces
US20090047197A1 (en) * 2007-08-16 2009-02-19 Gm Global Technology Operations, Inc. Active material based bodies for varying surface texture and frictional force levels
US20140026554A1 (en) * 2012-07-27 2014-01-30 GM Global Technology Operations LLC Superelastic shape memory alloy overloading and overheating protection mechanism

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