Research on microstructure and mechanical properties at elevated temperature of Al-Mg-Si-Sc-Zr alloy strengthened by Al3(Sc, Zr) nanoprecipitates

被引：14
作者：
Yu, Miao [1 ]
Zhu, Bing [1 ]
Li, Ning [1 ]
Zheng, Haiyang [1 ]
Lu, Yang [1 ]
Yu, Xiaopeng [1 ]
机构：
[1] Jilin Normal Univ, Jilin Prov Key Lab Numer Simulat, Siping 136000, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2024年 / 985卷
基金：
中国国家自然科学基金;
关键词：
Microstructure; Tensile properties; High temperature; Coarsening resistance; Dislocations; Al3(Sc; Zr); nanoprecipitates; EVOLUTION;
D O I：
10.1016/j.jallcom.2024.174050
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work, a newly designed Al-Mg-Si-Sc-Zr alloy was prepared to study the effect of Al3(Sc, Zr) nanoprecipitates on microstructure evolution and high-temperature properties. Modified by Sc, Zr, huge dendritic grains were refined to small equiaxed grains, and coarse intermetallics along grain boundaries were also modified to small pieces. Numerous Ll2-ordered Al3(Sc, Zr) nanoprecipitates with spherical shape ranging from 20 nm to 60 nm generated during heat treatment, and they were fully coherent with alpha-Al matrix. During cold rolling deformation, a further DRV, DRX happened in Al-Mg-Si-Sc-Zr alloy due to severe dislocation accumulation caused by Al3(Sc, Zr) nanoprecipitates. Compared with Al-Mg-Si matrix alloy, the YS, UTS and EL of AlMg-Si-Sc-Zr alloy at 250 degrees C were increased by 26.0%, 25.1% and 22.3% respectively. At elevated temperature, nanosized Al3(Sc, Zr) particles with excellent coarsening resistance could well maintain their morphology and structure. These thermally stable Al3(Sc, Zr) nanoprecipitates can retard dislocation motion and pin grain boundaries effectively during high-temperature tensile process, contributing to the prominent enhancement on the matrix alloy at elevated temperature.
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页数：10
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