Unlock instant, AI-driven research and patent intelligence for your innovation.

A high-strength, high-heat-resistant, low-scandium silver-added al-cu-mg alloy and its heat treatment process

A technology with high heat resistance and alloying, which is applied in the field of low-scandium silver Al-Cu-Mg alloy and its heat treatment process, and can solve the problems of undisclosed data and technical experience, expensive addition cost, etc.

Active Publication Date: 2021-10-08
XI AN JIAOTONG UNIV
View PDF5 Cites 0 Cited by
  • 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 research work on heat-resistant Al-Cu-Mg-Ag-based alloys and Al-Sc-based alloys has been carried out abroad for more than ten years, and a large amount of data and technical experience have not been disclosed.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A high-strength, high-heat-resistant, low-scandium silver-added al-cu-mg alloy and its heat treatment process
  • A high-strength, high-heat-resistant, low-scandium silver-added al-cu-mg alloy and its heat treatment process
  • A high-strength, high-heat-resistant, low-scandium silver-added al-cu-mg alloy and its heat treatment process

Examples

Experimental program
Comparison scheme
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.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses an Al-Cu-Mg alloy with high strength, high heat resistance and low scandium silver addition and a heat treatment process thereof. Cu and Mg in the alloy are the main alloying elements; Sc, Zr, Si, Ag, Ti, Mn, V are microalloying elements; the mass percentage of Fe in impurities is appropriately relaxed, and the rest including Ni and Zn Impurities need to be strictly controlled. For alloys with Mg content > 0.3%, hot deformation is performed before homogenization to avoid hot cracking tendency, and then re-homogenization is performed. The aging treatment of the present invention includes the combination of natural aging and artificial aging, improves the microstructure and strength through the correlation of cluster-precipitation behavior, and can make the target alloy at room temperature while controlling the amount of expensive scandium and silver to less than 0.2%. The tensile strength is greater than 470MPa, and the tensile strength at 300°C and 400°C is greater than 160MPa and 100MPa respectively.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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