RU2447174C1 - Aluminium-based cast alloy - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: aluminium-based cast alloy has the following chemical composition, in wt %: Cu 3.5-6.0, Mg 0.2-0.9, Ti 0.1-0.4, Zr 0.1-0.5, Mn 0.2-1.2, Zn 0.5-2.5, Sc 0.15-0.5, Al making the rest.

EFFECT: reduced metal consumption, higher reliability in operation.

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Description

The invention relates to non-ferrous metallurgy, in particular, to casting alloys based on aluminum, used in aircraft and other engineering industries for loaded parts of the internal fuselage set, control parts, power brackets, etc. in exchange for stampings operating for a long time up to 250 ° C.

Known casting alloy based on aluminum, containing (wt.%):

Cu 3,5-5,5 Mg 0.2-0.5 Zr 0.1-0.4 Ti 0.1-0.4 Al the rest (Application Japan No. 58-5979)

The alloy has reduced values of mechanical and casting properties.

Known high-strength casting alloy based on aluminum, containing (wt.%):

Cu 4,5-5,1 Mn 0.35-0.8 Ti 0.15-0.35 Cd 0.07-0.25 Al the rest (GOST 1583-93)

Also known is a high-strength casting alloy based on aluminum, containing (wt.%):

Cu 5.0-6.5 Mn 0.15-0.5 Ti 0.05-0.3 Cr 0.1-0.25 Cd 0.05-0.2 Al the rest (a.c. of the USSR No. 678889)

Known alloys have low manufacturability when casting in sand forms.

The closest analogue taken for the prototype is a casting alloy based on aluminum, containing copper, magnesium, titanium, zirconium in the following ratio of components, wt.%:

Cu 3,5-5,0 Mg 0.55-1.0 Ti 0.21-0.5 Zr 0.10-0.5 Al the rest (RF Patent No. 2080407)

The disadvantage of the prototype alloy is not high enough casting properties, tensile strength and quality of castings.

The technical task of the invention is the creation of a casting alloy based on aluminum with improved casting properties (fluidity and heat resistance), tensile strength, which will improve the quality of complex configuration shaped castings.

The technical task is achieved by the fact that the proposed casting alloy based on aluminum, containing copper, magnesium, titanium, zirconium, characterized in that it further contains manganese, zinc, scandium in the following ratio of components (wt.%):

Cu 3,5-6,0 Mg 0.2-0.9 Ti 0.1-0.4 Zr 0.1-0.5 Mn 0.2-1.2 Zn 0.5-2.5 Sc 0.15-0.5 Al rest

It is established that with the stated ratio and content of components with the introduction of manganese, zinc, scandium, the foundry and strength properties increase.

Examples of implementation

Example 1

Preparation of an experimental alloy in an electric furnace with the composition Al - 3.5% Cu - 0.2% Mg - 0.1% Ti - 0.1% Zr - 0.2% Mn - 0.5% Zn - 0.15% Sc.

Aluminum was loaded and melted into the preheated electric furnace. Then ligatures Al-Cu, Al-Mn and Al-Ti, Al-Sc, Al-Zr, magnesium and zinc were introduced, the melt was mixed, aged, treated with potassium fluorozirconate. The composition of the experimental alloy and the values of mechanical and technological properties are given in tables 1, 2.

Examples 2, 3 are similar to example 1, example 4 is a prototype. The alloy compositions are shown in table 1.

Table 2 shows the mechanical and technological properties of samples cut from castings of the proposed alloy and prototype alloy, the Al-Cu-Mg system.

The mechanical properties were determined after heat treatment according to the T5 mode: hardening + artificial aging, for the prototype alloy according to the T4 mode: hardening + natural aging.

From table 2 it follows that for castings (body, lid) of the proposed alloy, the technological properties are significantly higher compared to the prototype: fluidity increases by 20-24%, heat resistance decreases by 60%, linear shrinkage decreases by 15%. The tensile strength increases by 5-7.5%.

Shaped castings passed quality control. No castings were found.

Thus, the use of the proposed alloy of the Al-Cu-Mg system in products for shaped castings of complex configuration of parts of the inner set will allow to obtain high-quality castings with high technological properties with strength properties at the level of the prototype. This will reduce the metal consumption and increase the reliability in operation and resource of products.

Claims (1)

Cast aluminum alloy based on aluminum, containing copper, magnesium, titanium, zirconium, characterized in that it additionally contains manganese, zinc, scandium in the following ratio of components, wt.%:
Cu 3,5-6,0 Mg 0.2-0.9 Ti 0.1-0.4 Zr 0.1-0.5 Mn 0.2-1.2 Zn 0.5-2.5 Sc 0.15-0.5 Al rest