High-strength high-heat-resistance low-scandium sliver added Al-Cu-Mg-series alloy and thermal treatment process thereof

A high heat resistance and alloy technology, applied in the field of low-scandium silver Al-Cu-Mg alloy and its heat treatment process, can solve the problems of expensive addition cost, undisclosed data and technical experience, etc., so as to reduce the preparation cost, excellent The effect of mechanical properties

Active Publication Date: 2020-07-17
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the use of elements such as Ag and Sc can effectively improve the performance, its expensive addition cost prohibits most commercial aluminum alloys.
At the same time, the preliminary r...

Method used

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  • High-strength high-heat-resistance low-scandium sliver added Al-Cu-Mg-series alloy and thermal treatment process thereof
  • High-strength high-heat-resistance low-scandium sliver added Al-Cu-Mg-series alloy and thermal treatment process thereof
  • High-strength high-heat-resistance low-scandium sliver added Al-Cu-Mg-series alloy and thermal treatment process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0017] An Al-Cu-Mg alloy with high strength, high heat resistance and low scandium silver added, comprising the following steps: (1). Al-4.2Cu-1.5Mg-0.15Sc-0.10Zr-0.12Si- 0.09Ti-0.79Mn-0.3Fe (by mass percentage) alloy ingot was cast, then the ingot was kept at 480°C for 24 hours, and then the temperature was gradually raised to 495°C with the furnace at a heating rate of 5°C / hour, and kept at 12 hours. (2). The processed samples were stored at room temperature for 2 weeks, then aged at 175°C for 12 hours, and air-cooled after taking out the samples.

Embodiment 2

[0019] An Al-Cu-Mg alloy with high strength, high heat resistance and low scandium silver added, comprising the following steps: (1). Al-3.8Cu-1.0Mg-0.16Sc-0.13Zr-0.02Si- 0.02Ti-0.34Mn-0.05Fe (by mass percentage) alloy ingot was cast, then the ingot was kept at 480°C for 24 hours, and then the temperature was gradually raised to 485°C with the furnace at a heating rate of 5°C / hour, and kept at 12 hours. Immediately after the sample was taken out, it was hot-extruded into a 10mm bar, and then air-cooled; (3). The bar in step (2) was homogenized twice at 515° C., kept for 12 hours, and then quenched in warm water. (4). The processed samples were stored at room temperature for 2 weeks, then aged at 175°C for 12 hours, and air-cooled after taking out the samples.

Embodiment 3

[0021] An Al-Cu-Mg alloy with high strength, high heat resistance and low scandium silver added, comprising the following steps: (1). Al-6.8Cu-0.89Mg-0.05Sc-0.20Zr-0.06Si- 0.05Ti-0.88Mn-0.30Fe-0.18Ag (in terms of mass percentage) alloy ingot casting, then the ingot was kept at 485°C for 24 hours, and then the temperature was gradually raised to 515°C with the furnace, the heating rate was 5°C / hour, and the heat preservation time was 24 hours. Hour. Quench the sample in warm water immediately after taking it out; (2). The sample that has been processed in step (1) is parked at room temperature for 2 weeks, then aged at 175° C. for 8 hours, and air-cooled after taking out the sample.

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Abstract

The invention discloses a high-strength high-heat-resistance low-scandium sliver added Al-Cu-Mg-series alloy and a thermal treatment process thereof. Cu and Mg in the alloy are main alloyed elements;Sc, Zr, Si, Ag, Ti, Mn and V are micro-alloyed elements; mass percentage content of Fe in impurities is properly broadened, and the rest of impurities including Ni and Zr need to strictly control; forthe alloy with Mg content greater than 0.3%, thermal deformation is performed before homogenization to avoid hot cracking tendency, and then homogenization is performed again. Ageing treatment comprises combination of natural ageing and artificial ageing; a micro structure and strength are improved by relevance of cluster-precipitation behaviors; and while usage amount of dear scandium and sliverelements is controlled to be smaller than 0.2%, room-temperature tensile strength of the target alloy can be higher than 470 MPa, and tensile strength at a temperature of 300 DEG C and a temperatureof 400 DEG C is separately greater than 160 MPa and 100 MPa.

Description

technical field [0001] The invention relates to the technical field of nonferrous metals, in particular to a high-strength and high-heat-resistant low-scandium silver Al-Cu-Mg alloy and a heat treatment process thereof. Background technique [0002] 2xxx series (Al-Cu) alloys, as a typical representative of age-strengthable aluminum alloys, have excellent comprehensive mechanical properties, and are generally considered to be a series of better heat resistance among aluminum-based alloys. Usually, different contents of Mg need to be added to 2xxx series alloys to improve their age hardening properties. Taking the classic 2024 alloy as an example, its main alloying elements include Cu: 3.8%-4.9%, Mg: 1.2%-1.8%, and other elements such as Mn and Si. The main role of Mg in it is to combine with Cu to form Cu-Mg co-clusters to make the alloy harden rapidly during natural aging, or to combine the supersaturated solid solution (SS) of the Al-Cu binary system—GPB zones— The θ”—θ’...

Claims

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Application Information

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IPC IPC(8): C22C21/16C22F1/057
CPCC22C21/14C22C21/16C22F1/002C22F1/057
Inventor 刘刚高一涵孙军杨冲张金钰
Owner XI AN JIAOTONG UNIV
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