Thermal stability of ultra-fine grained 2024 aluminum alloy prepared by friction stir processing

被引：0

作者：

Sun, Meina ^{[1
]}

Wang, Kuaishe ^{[1
]}

Xu, Ruiqi ^{[1
]}

Wang, Wen ^{[1
]}

Hao, Yaxin ^{[1
]}

Li, Yao ^{[2
]}

机构：

[1] School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an

[2] Aviation Industry Corporation Xi'an Aircraft Industry(Group) Co. Ltd., Xi'an

来源：

Xiyou Jinshu/Chinese Journal of Rare Metals | 2014年 / 38卷 / 05期

关键词：

Friction stir processing; Microstructure; Thermal stability; Ultra-fine grained;

D O I：

10.13373/j.cnki.cjrm.2014.05.007

中图分类号：

学科分类号：

摘要：

Ultra-fine grained 2024 aluminum alloy was obtained by friction stir processing (FSP), the average grain size was 600 nm, microstructure and mechanical properties of ultra-fine grained 2024 aluminum alloy at room temperature were observed and measured after annealing at different temperatures, and the thermal stability of ultra-fine grained 2024 aluminum alloy was investigated. It was found that the phenomenon of annealing strengthening occurred at 150~200℃, and the mechanical properties improved slightly; from 250 to 350℃, grain refinements strengthening and precipitates strengthening weakened due to that grains and precipitates grew up, and the thermal stability of the ultra-fine grained 2024 aluminum alloy was poor. Grains and precipitates grew rapidly with the temperature increasing, phenomenon of annealing softening occurred. The grain size of the aluminum alloy was larger than 2 μm when the temperature increased to 400℃, phenomenon of solution strengthening occurred, and the tensile strength was improved by 54 MPa compared with that at 350℃. The results showed that the optimal thermal stability of ultra-fine grained 2024 aluminum alloy was observed at annealing temperature of 200℃, the average grain size was 0.807 μm, microhardness was HV110.7 and tensile strength was 359 MPa. ©, 2014, Editorial Office of Chinese Journal of Rare Metals. All right reserved.

引用

页码：780 / 785

页数：5

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