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A heat-resistant cast aluminum-copper alloy and its preparation method

A technology of casting aluminum and copper alloys, which is applied in the field of metal materials, can solve problems such as unsatisfactory, exceeding 250°C or even higher, and achieve the effects of reducing segregation of alloy elements, reducing micro porosity, and improving strength and elongation

Active Publication Date: 2019-12-10
北京世联信诺科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with traditional cast aluminum alloys, aluminum-copper alloys have better heat resistance, the highest heat resistance, and the service temperature can reach 200°C, but they still cannot meet the needs of some special, closed, high-temperature occasions, such as the support of some special engines Seats, hoods, engine cold ends and other components, these special components usually require a service temperature of more than 250 ° C or even higher, so it is necessary to develop a high temperature resistant cast aluminum alloy

Method used

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  • A heat-resistant cast aluminum-copper alloy and its preparation method
  • A heat-resistant cast aluminum-copper alloy and its preparation method
  • A heat-resistant cast aluminum-copper alloy and its preparation method

Examples

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Embodiment 1

[0029] A heat-resistant cast aluminum-copper alloy disclosed in Example 1 has the following mass percentages of its components: Cu: 2.9%, Mn: 0.61%, Ti: 0.32%, Sc: 0.35%, Zr: 0.17%, Cd: 0.21 %, B: 0.003%, impurity is not more than 0.08%, and the balance is aluminum.

[0030] The preparation method of the heat-resistant cast aluminum-copper alloy containing the above-mentioned components is as follows:

[0031] Step 1: First heat the furnace to 300-400°C and keep it warm for 25 minutes, then add pure aluminum, AlCu50, AlTi4, AlSc2, AlZr4, AlMn10 (the content of elements in the master alloy meets the requirements of GB / T 27677-2011) in the middle The alloy is smelted so that the component contents of Cu, Ti, Sc, Zr, and Mn meet the aforementioned percentages. Raise the temperature of the furnace to 825°C and keep it warm for 1.5h. After the aluminum ingot and other components are completely melted into an aluminum alloy solution, add a part of Al5TiB1A master alloy (the element...

Embodiment 2

[0041] A heat-resistant cast aluminum-copper alloy disclosed in Example 2, the mass percentages of its components are as follows: Cu: 3.3%, Mn: 0.67%, Ti: 0.42%, Sc: 0.41%, Zr: 0.18%, Cd: 0.25% %, B: 0.01%, impurity is not more than 0.05%, and the balance is aluminum.

[0042] The heat-resistant casting aluminum-copper alloy of the component content described in embodiment 2, its preparation method is as follows:

[0043]The first step: first raise the temperature of the furnace to 350 ° C for 30 minutes, and then add pure aluminum, AlCu50, AlTi4, AlSc2, AlZr4, AlMn10 (the element content requirements in the master alloy meet the requirements of GB / T 27677-2011) master alloy Smelting, so that the content of components such as Cu, Ti, Sc, Zr, Mn meets the percentage of Example 2, the furnace is heated to 835 ° C, kept for 1.5 h, after the aluminum-copper alloy is completely melted, add a part of Al5TiB1A master alloy (according to Mass percentage, the content of adding B accou...

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Abstract

The invention discloses a heat-resisting casting Al-Cu alloy. The heat-resisting casting Al-Cu alloy comprises, by mass, 2.0-3.5% of Cu, 0.5-0.8% of Mn, 0.2-0.6% of Ti, 0.2-0.5% of Sc, 0.1-0.3% of Zr,0.2-0.35% of Cd, less than or equal to 0.1% of impurities, and the balance Al. The heat-resisting casting Al-Cu alloy is high in strength, good in ductility, and can be used for a long time at the high temperature of 280 DEG C. Compared with a traditional high copper ZL205A alloy, under the same T6 heat treatment condition (538 DEG C 15h+indoor temperature water quenching+175 DEG C 3h), the extension strength of the heat-resisting casting Al-Cu alloy is 20-30 MPa higher, and the strength is not declined at the temperature of 280 DEG C for 100h.

Description

technical field [0001] The application belongs to the field of metal materials, and relates to a heat-resistant cast aluminum-copper alloy and a preparation method thereof. Background technique [0002] Aluminum-copper alloy is a kind of light-weight, high-strength, heat-resistant cast aluminum alloy. It is often used in secondary load-bearing parts of aircraft, automobiles, and turbines. It has been popularized and applied in aviation, aerospace, high-speed rail, weapons and other fields. Compared with traditional cast aluminum alloys, aluminum-copper alloys have better heat resistance, the highest heat resistance, and the service temperature can reach 200°C, but they still cannot meet the needs of some special, closed, high-temperature occasions, such as the support of some special engines Seats, hoods, engine cold ends and other parts, these special parts usually require service temperatures exceeding 250 ° C or even higher, so it is necessary to develop a high temperatur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/12C22C1/02
CPCC22C1/026C22C21/12
Inventor 周广顺
Owner 北京世联信诺科技有限公司
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