Fabrication of high-strength Mg-Y-Sm-Zn-Zr alloy by conventional hot extrusion and aging

被引：29
作者：
Lyu, Shaoyuan [1 ]
Xiao, Wenlong [1 ]
Zheng, Ruixiao [1 ]
Wang, Fang [1 ]
Hu, Tong [1 ]
Ma, Chaoli [1 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Key Lab Aerosp Adv Mat & Performance, Minist Educ, Beijing 100191, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 732卷
基金：
中国国家自然科学基金;
关键词：
Mg-RE alloy; Extrusion; Microstructure; Precipitation; High strength; STACKING ORDERED STRUCTURE; MECHANICAL-PROPERTIES; MAGNESIUM ALLOY; MICROSTRUCTURE EVOLUTION; HEAT-TREATMENT; GD ALLOYS; PRECIPITATION; PHASE; DUCTILITY; ADDITIONS;
D O I：
10.1016/j.msea.2018.06.085
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A high-strength Mg-7Y-5Sm-0.5Zn-0.3Zr alloy was developed successfully by hot extrusion and subsequent aging treatment. The results showed that the as-solutionized alloy mainly contained alpha-Mg matrix and 14H LPSO phase distributed at grain boundaries. Lamellar LPSO and gamma' phases were dynamically precipitated during hot extrusion and retained after artificial aging treatment at 200 degrees C. After peak-aged treatment, the alloy exhibited excellent mechanical properties with ultimate tensile strength of 465 MPa, 0.2% proof stress of 413 MPa and elongation to failure of 6.5% at room temperature. The high yield strength was attributed to the combined action of 14H-LPSO phase, basal gamma' precipitates and dense distribution of beta' precipitates at prismatic plane.
引用
收藏
页码：178 / 185
页数：8
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