A high-strength and heat-resistant low-scandium composite microalloyed al-cu alloy and its heat treatment process

A micro-alloying and al-cu technology, which is applied in the field of low-scandium composite micro-alloying Al-Cu alloy and its heat treatment process, can solve the problems of insufficient strength and so on

Active Publication Date: 2021-11-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention aims to reduce the use of expensive Sc elements by implementing effective and easy composite microalloying means and supporting reasonable heat treatment process system, and overcome the high temperature service environment of traditional heat treatable aluminum alloys at 300°C-400°C The bottleneck problem of insufficient strength

Method used

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  • A high-strength and heat-resistant low-scandium composite microalloyed al-cu alloy and its heat treatment process
  • A high-strength and heat-resistant low-scandium composite microalloyed al-cu alloy and its heat treatment process
  • A high-strength and heat-resistant low-scandium composite microalloyed al-cu alloy and its heat treatment process

Examples

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Effect test

Embodiment 1

[0020] A high-strength and heat-resistant low-scandium composite microalloyed Al-Cu alloy and its heat treatment process include the following steps: (1). Al-4.5Cu-0.15Sc-0.15Zr-0.03Er-0.15 is produced by conventional metal mold casting Ti-0.2Mn (in mass percent) alloy ingot casting, followed by primary homogenization of the ingot at 500°C for 4 hours, and secondary homogenization at 535°C for 12 hours, followed by quenching in cold water; ( 2). After aging the homogenized sample in step (1) for 3 hours at 155°C, the sample was gradually heated up at a rate of 5°C per hour. The final treatment temperature was 285°C, and the sample was taken out and cooled in air.

Embodiment 2

[0022] A high-strength and heat-resistant low-scandium composite microalloyed Al-Cu alloy and its heat treatment process include the following steps: (1). Al-3.2Cu-0.10Sc-0.12Zr-0.02Er-0.11 is produced by conventional metal mold casting Ti-0.15Mn (by mass percent) alloy ingot casting followed by primary homogenization at 500°C for 4 hours, secondary homogenization at 535°C for 12 hours, and 3 hours at 575°C The three-stage homogenization, followed by quenching in cold water; (2). After the sample that has been homogenized in step (1) is aged at 155 ° C for 3 hours, the sample is gradually heated at a heating rate of 5 ° C per hour, The final treatment temperature was 285°C, and the samples were taken out and cooled in air.

Embodiment 3

[0024] A high-strength and heat-resistant low-scandium composite microalloyed Al-Cu alloy and its heat treatment process include the following steps: (1). Al-2.8Cu-0.15Sc-0.15Zr-0.03Er-0.02 is produced by conventional metal mold casting Ti (in mass percent) alloy ingots followed by primary homogenization at 500°C for 4 hours, secondary homogenization at 535°C for 12 hours, and third stage homogenization at 575°C for 3 hours Homogenization, followed by quenching in cold water; (2). After aging for 3 hours at 175°C for the sample that has been homogenized in step (1), gradually increase the temperature of the sample at a rate of 5°C per hour, and the final treatment temperature at 300°C, take out the sample and cool it in air.

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Abstract

The invention discloses a high-strength and high-temperature-resistant low-scandium composite microalloyed Al-Cu alloy and a heat treatment process thereof. Its main alloying elements include Cu, Sc, Si, Zr, Er, Ti, Mn, Fe as an impurity element should be limited to <0.15% by mass, and the rest are Al and unavoidable impurities. The alloy ingot is cast by conventional metal mold or sand mold casting, and can be hot deformed before solution treatment. The corresponding heat treatment process includes multi-stage homogenization and subsequent isochronic aging treatment. At the same time, it should be noted that for alloy materials with high Cu content, a more gentle homogenization treatment (lower temperature, prolong the holding time) and slower heating in the low temperature range Aging heating rate. The Al-Cu alloy material prepared according to this patent reduces the use of expensive Sc elements through appropriate composite microalloying means and structure design, significantly improves the high-temperature tensile properties of the alloy, and has good room temperature mechanical properties and 300 -400℃Excellent high temperature tensile strength and creep resistance.

Description

technical field [0001] The invention relates to the technical field of age-strengthening aluminum alloys, in particular to a high-strength and heat-resistant low-scandium composite microalloyed Al-Cu alloy and a heat treatment process thereof. Background technique [0002] As a structural material with high specific strength and high corrosion resistance, aluminum alloy is widely used in the manufacture of structural parts in many fields such as aerospace and automobile manufacturing because of its light weight, wide performance range and easy adjustment. Al-Cu(2xxx) alloys, as a typical type of heat-treatable and strengthened aluminum alloys, can obtain good comprehensive mechanical properties at room temperature and high-temperature mechanical properties through the improvement of the heat treatment system and the improvement of the alloy components. The manufacture of important structural parts such as engine cylinder heads and high-speed aircraft skins can partially repl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/14C22F1/057C22C21/12
CPCC22C21/12C22C21/14C22F1/002C22F1/057
Inventor 刘刚高一涵孙军杨冲张金钰
Owner XI AN JIAOTONG UNIV
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