Study on microstructure, tensile performance and creep resistance of Al-Mg-Si-Sc-Zr alloy strengthened by Al 3 (Sc, Zr) nanoprecipitates

被引：15
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：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2024年 / 897卷
基金：
中国国家自然科学基金;
关键词：
Microstructure; Al3(Sc; Zr) nanoprecipitates; Tensile performances; Creep resistance; Coarsening resistance; Strengthening mechanisms; MECHANICAL-PROPERTIES; PRECIPITATION; EVOLUTION; BEHAVIOR; ADDITIONS; EXTRUSION;
D O I：
10.1016/j.msea.2024.146362
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this work, a newly designed Al-Mg-Si-Sc-Zr alloy with both excellent room-temperature tensile performances and high-temperature creep resistance was prepared. The microstructure of Al-Mg-Si matrix alloy was significantly modified by Sc, Zr micro-alloying. The average grain size of Al-Mg-Si-Sc-Zr alloy in as-cast and as-rolled states was 68.3 mu m and 7.33 mu m respectively, which was far smaller than those of Al-Mg-Si alloy. Numerous Ll 2 - ordered Al 3 (Sc, Zr) nanoprecipitates ranging from 20 to 60 nm were generated during heat treatment, and they had a strong coherent interface relation with alpha-Al matrix. During rolling deformation, a further DRX (dynamic recrystallization) progress happened in Al-Mg-Si-Sc-Zr alloy due to the severe dislocations pile-up caused by Al 3 (Sc, Zr) nanoprecipitates. The YS (yield strength), UTS (ultimate tensile strength) and EL (elongation) of asrolled Al-Mg-Si-Sc-Zr alloy at room temperature were 315.2 MPa, 372.3 MPa and 20.1 % respectively, which were increased by 21.9 %, 17.1 % and 41.5 % compared to tensile performances of Al-Mg-Si matrix alloy. An enhanced high-temperature creep resistance was obtained by Al-Mg-Si-Sc-Zr alloy, which was mainly attributed to the outstanding thermal stability possessed by Al 3 (Sc, Zr) nanoprecipitates. The strengthening mechanisms including grain refinement strengthening and Orowan strengthening were also discussed.
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页数：12
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