High-strength creep-resistant scandium-containing Al-Cu series aluminum alloy and casting and heat treatment processes

A creep-resistant, casting aluminum alloy technology, applied in the field of metal materials, to achieve the effect of expanding application space, improving ductility, and inhibiting rapid coarsening

Inactive Publication Date: 2018-05-18
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the problem of improving the mechanical properties of cast Al-Cu alloy at room temperature, especially the high temperature mechanical properties

Method used

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  • High-strength creep-resistant scandium-containing Al-Cu series aluminum alloy and casting and heat treatment processes
  • High-strength creep-resistant scandium-containing Al-Cu series aluminum alloy and casting and heat treatment processes
  • High-strength creep-resistant scandium-containing Al-Cu series aluminum alloy and casting and heat treatment processes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A high-strength creep-resistant Sc-containing cast Al-Cu alloy and its aging heat treatment process include the following steps: (1) the preparation method of the alloy is to place pure Al in a melting furnace and heat it up to 730 ° C to melt, Then add Al-50wt.%Cu master alloy and Al-2wt.%Sc master alloy in specified ratio, and keep stirring until they are completely melted. Then control the temperature to 730°C, add 2% refining agent for refining, let it stand for 30 minutes, and cast it in a metal mold to obtain Al-2.5wt.%Cu-0.1wt.%Sc (hereinafter referred to as Al-2.5Cu- 0.1Sc) aluminum alloy. (2) Homogenize the alloy ingot at 450°C for 4 hours; (3) Perform solution treatment at 590°C for 3 hours on the sample that has been homogenized in step (2), and then quench in cold water (4) Carry out aging treatment for 8 hours at 250 ℃ to the sample that step (3) solid solution treatment is completed.

Embodiment 2

[0018] A high-strength creep-resistant Sc-containing cast Al-Cu alloy and its aging heat treatment process include the following steps: (1) the preparation method of the alloy is to place pure Al in a melting furnace and heat it up to 730 ° C to melt, Then add Al-50wt.%Cu master alloy and Al-2wt.%Sc master alloy in specified ratio, keep stirring until completely melted, then control the temperature to 730°C, add 2% refining agent for refining, and let stand for 30min, Cast in a metal mold to prepare Al-2.3wt.%Cu-0.22wt.%Sc (hereinafter referred to as Al-2.3Cu-0.22Sc) aluminum alloy. (2) Homogenize the alloy ingot at 450°C for 4 hours; (3) Perform solution treatment at 590°C for 3 hours on the sample that has been homogenized in step (2), and then quench in cold water (4) Carry out aging treatment for 8 hours at 250 ℃ to the sample that step (3) solid solution treatment is completed.

Embodiment 3

[0020] The high-strength, creep-resistant, Sc-containing cast Al-Cu alloy and its aging heat treatment process include the following steps: (1) The alloy is prepared by heating pure Al in a melting furnace to 730°C until melting, and then adding The specified ratio of Al-50wt.% Cu master alloy and Al-2wt.% Sc master alloy is continuously stirred until it is completely melted, and then the temperature is controlled to 730°C, and 2% refining agent is added for refining. After standing for 30 minutes, the metal Casting in a mold to prepare an Al-2.5wt.%Cu-0.6wt.%Sc (hereinafter referred to as Al-2.5Cu-0.6Sc) aluminum alloy. (2) Homogenize the alloy ingot at 450°C for 4 hours; (3) Perform solution treatment at 590°C for 3 hours on the sample that has been homogenized in step (2), and then quench in cold water (4) Carry out aging treatment for 8 hours at 250 ℃ to the sample that step (3) solid solution treatment is completed.

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Abstract

The invention discloses a high-strength creep-resistant scandium-containing Al-Cu series aluminum alloy and a casting and a heat treatment processes. The alloy comprises the components of, the mass percent of Cu are 2.0-5.0%, the mass percent of Sc is 0.1-0.5%, the mass percent of Si is 0.01-0.03%, the mass percent of Ti is 0.01-0.03%, the balance Al and inevitable impurities, and conventional casting is carried out. The aging heat treatment process comprises the steps of homogenizing treatment, a heat preservation is carried out for 3 hours to 50 hours, and air cooling is carried out; carrying out solid solution treatment, the heat preservation is carried out for 30 minutes to 15 hours, and water quenching is carried out; aging treatment, the heat preservation is carried out for 1 hours to 20 hours. According to the high-strength creep-resistant scandium-containing the Al-Cu series aluminum alloy and the casting and the heat treatment processes, a small amount of Sc elements are addedinto the Al-Cu alloy, the result shows that the Sc not only can obviously be refined the theta'-Al2Cu precipitation phase, but also improve a precipitation density of the precipitated phase of the theta'-Al2Cu, and a room temperature strength of the Al-Cu alloy is obviously further improved.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to an aluminum alloy material, in particular to a preparation and heat treatment process of a scandium-containing Al-Cu alloy. Compared with the traditional Al-Cu alloy, the strength at room temperature is greatly improved while the strength is increased. High temperature creep resistance. Background technique [0002] Among light alloys, aging aluminum alloys, as an important class of structural materials, have the characteristics of high specific strength, good processability and excellent corrosion resistance, and are widely used in the automotive and aerospace industries. Al-Cu alloy is the most representative binary alloy among aging aluminum alloys. Because of its low density, high specific strength, and excellent machinability, its casting alloys are widely used in aviation products, and It is mainly used as a structural part that bears a large load. However, in general, Al-Cu ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/14C22C1/03C22F1/057
CPCC22C21/14C22C1/026C22C1/03C22F1/002C22F1/057
Inventor 孙军刘刚杨冲高一涵张金钰吴凯
Owner XI AN JIAOTONG UNIV
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