Enhancement of mechanical properties of duplex Mg-9Li-3Al alloy by Sn and Y addition

被引：39
作者：
Chang, Li-li [1 ]
Shi, Chun-chang [1 ]
Cui, Hong-wei [2 ]
机构：
[1] Shandong Univ, Sch Mat Sci & Engn, Jinan 250061, Shandong, Peoples R China
[2] Shandong Univ Technol, Sch Mat Sci & Engn, Zibo 255000, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2018年 / 28卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Mg-Li alloys; grain structure; tensile properties; precipitation strengthening; HOMOGENIZATION TREATMENT; CA ALLOYS; AS-CAST; MICROSTRUCTURE; ZN; EVOLUTION; TEMPERATURE; EXTRUSION;
D O I：
10.1016/S1003-6326(18)64635-7
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
For enhancement of mechanical properties in Mg-9Li-3Al alloys, Mg-9Li-3Al duplex alloys were alloyed by addition of Sn and Y. Microstructure evolution and mechanical property response of as-cast Mg-9Li-3Al alloys by alloying with Sn and Y were investigated by optical microscopy, scanning electron microscopy, X-ray diffractometry and tensile tests. The results indicate that considerable blocky dendrites of primary alpha phase in Mg-9Li-3Al alloys become lath-like due to the addition of Sn. With addition of Y, Mg-9Li-3Al alloy consists of both block-like and lath-like alpha-Mg dendrites. The as-cast Mg-9Li-3Al-1Sn-1Y alloy shows a yield strength of 118 MPa, ultimate tensile strength of 148 MPa and the elongation to failure of 21%. Improvement in both strength and elongation of Mg-9Li-3Al alloys with Sn and Y addition is attributed to the combined action of MgLi2Sn and Al2Y intermetallic compounds.
引用
收藏
页码：30 / 35
页数：6
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