MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Mg-Li ALLOY WITH Ca ADDITION
来源期刊：Acta Metallurgica Sinica2006年第5期
论文作者：H.B. Ji H.J. Yu Z.Q. Guo H.B. Li Y.H. Liu G.C. Yao
Key words：calcium; Mg-Li-Zn alloy; cold rolling; microstructure; tensile property;
Abstract: Mg-9wt%Li-2wt%Zn alloy was prepared and studied in this article. The addition of Ca to the alloy from 0.1wt% to 1wt% can refine the α-Mg and the best effect of refinement occurs when Ca content is 0.4wt%-0.5wt%. The billets can be rolled to thin sheets at room temperature,from which it is obvious that the addition of Ca improves alloys' formality, while it decreases with the excess addition of Ca. The results also show that the ultimate tensile strength (UTS)and yield strength (YS) of the alloy with 1wt% Ca may rise by 28% and 25%, respectively,however, the elongation decreases. It is clarified that the adsorption of proper Ca on the grain boundaries refines α-Mg and improves the tensile properties, but the presence of excess Ca and stable Ca2Mg6Zn3phase worsens the elongation.
H.B. Ji1，H.J. Yu1，Z.Q. Guo1，H.B. Li1，Y.H. Liu1，G.C. Yao1
(1.School of Materials & Metallurgy, Northeastern University, Shenyang 110004, China)
Abstract:Mg-9wt%Li-2wt%Zn alloy was prepared and studied in this article. The addition of Ca to the alloy from 0.1wt% to 1wt% can refine the α-Mg and the best effect of refinement occurs when Ca content is 0.4wt%-0.5wt%. The billets can be rolled to thin sheets at room temperature,from which it is obvious that the addition of Ca improves alloys'' formality, while it decreases with the excess addition of Ca. The results also show that the ultimate tensile strength (UTS)and yield strength (YS) of the alloy with 1wt% Ca may rise by 28% and 25%, respectively,however, the elongation decreases. It is clarified that the adsorption of proper Ca on the grain boundaries refines α-Mg and improves the tensile properties, but the presence of excess Ca and stable Ca2Mg6Zn3phase worsens the elongation.
Key words:calcium; Mg-Li-Zn alloy; cold rolling; microstructure; tensile property;
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