期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 509, 期 37, 页码 9045-9049出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.04.030
关键词
Y; Mg-Li alloy; Microstructure; Mechanical properties
资金
- National Natural Science Foundation of China [50871033]
- Key Project of Science and Technology of Harbin City [2008AA4CH044, 2009AA1AG065, 2010AA4BE031]
- Fundamental Research funds for the Central Universities [HEUCF101001]
- Research Fund for the Doctoral Program of Higher Education [20092304120020]
- Heilongjian Province Education Department [11553054]
The influence of Y on microstructure and mechanical properties of as-cast Mg-5Li-3Al-2Zn alloy was investigated. The results show that the phase compositions of Mg-5Li-3Al-2Zn consist of alpha-Mg and AlLi phases. Adding Y to the alloy results in the formation of Al2Y compound and facilitates grain refinement. The addition of 0.8 wt.% Y produces the smallest grain size. The tensile tests performed at room temperature show that the additions of Y can improve the mechanical properties of the alloy; the tensile strength and ductility reach peak values when the Y additions are 0.8 wt.% and 1.2 wt.%, respectively. The mechanisms of improvement are related to grain refinement and compound strengthening effects. (C) 2011 Published by Elsevier B. V.
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