Microstructure and tensile properties of the friction stir processed LA103Z alloy

被引：23
作者：
Li, Yi [1 ,2 ]
Guan, Yanjin [1 ]
Liu, Ya [1 ]
Zhai, Jiqiang [1 ]
Hu, Kai [1 ]
Lin, Jun [1 ]
机构：
[1] Shandong Univ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Peoples R China
[2] Beijing Shougang Co Ltd, Qianshun Technol Ctr, Qianan 064404, Hebei, Peoples R China
来源：
MATERIALS CHARACTERIZATION | 2023年 / 196卷
基金：
中国国家自然科学基金;
关键词：
Friction stir processing; Microstructure; Mechanical properties; Strengthening mechanism; GRAIN-BOUNDARY SEGREGATION; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; MG; PHASE; TEMPERATURE; EVOLUTION; ALUMINUM; TEXTURE;
D O I：
10.1016/j.matchar.2022.112616
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In the present work, a high strength dual-phase Mg-Li alloy LA103Z was fabricated via friction stir processing (FSP). The microstructure, microhardness and tensile properties of the base metal (BM) and the friction stir processed material were systematically investigated. The beta-Li phase underwent complete dynamic recrystallization during FSP, causing significant grain refinement. A large part of the alpha-Mg phase dissolved under the action of frictional heat. Mg atoms near the grain boundaries formed continuous alpha-Mg layers around the beta-Li grains; part of Mg atoms at beta-Li grain interiors formed MgLi2Al phase with Al and Li; and the remaining Mg atoms dissolved in beta-Li matrix as solute atoms. Precipitation of MgLi2Al phase and AlLi phase increased during FSP. On account of the solid-solution strengthening and work hardening effect, LA103Z showed excellent mechanical properties after FSP. The ultimate tensile strength (UTS) of LA103Z was significantly increased from 177.9 MPa to 305.5 MPa, improved by 71.7%.
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页数：8
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