Effects of Ce-rich RE additions and heat treatment on the microstructure and tensile properties of Mg-Li-Al-Zn-based alloy
Effects of Ce-rich RE additions and heat treatment on the microstructure and tensile properties of Mg-Li-Al-Zn-based alloy
复制标题
富Ce稀土添加及热处理对Mg-Li-Al-Zn基合金显微组织和拉伸性能的影响
DOI：
10.1016/j.msea.2010.11.063
复制
发表时间：
2011-02-25
期刊：
影响因子：
6.4
通讯作者：
Zhang, Milin
中科院分区：
文献类型：
--
作者：
Wu, Libin;Cui, Chongliang;Zhang, Milin
在纯Ar气氛下制备了铸态Mg-5Li-3Al-2ZN-xRE(x=0~2.5wt.%)合金，研究了富Ce稀土和热处理对镁锂铝锌基合金组织和性能的影响。结果表明，镁-5Li-3Al-2ZN(LAZ532)合金的主要相组成为α-镁和AlLi。随着稀土的加入，Al-RE析出逐渐增多，而AlLi相逐渐减少。室温拉伸试验表明，稀土的加入能明显改善合金的力学性能，热处理后的力学性能进一步提高。更具体地说，铸态含稀土1.5wt%的合金具有良好的抗拉强度和塑性。经热处理后，含1.0wt%RE的合金具有较高的抗拉强度。抗拉强度的差异与不同合金体系中第二相的形态、分布和固溶强化有关。此外，合金的断裂方式以脆性解理为主，加入稀土后倾向于准解理。(C)2010爱思唯尔B.V.保留所有权利。
As-cast Mg-5Li-3Al-2Zn-xRE (x=0-2.5 wt.%) alloys were prepared under the ambient of pure argon, and the effects of Ce-rich rare earths (RE) and heat treatment on the microstructure and mechanical properties of Mg-Li-Al-Zn-based alloy were investigated. The results show that the main phase compositions of Mg-5Li-3Al-2Zn ( LAZ532) alloy consist of alpha-Mg and AlLi. With the addition of RE, Al-RE precipitate forms, and increases gradually, whereas AlLi phase decreases. The room temperature tensile test reveals that the addition of RE could clearly improves the mechanical properties of alloys which are further improved after heat treatment. In more detail, excellent tensile strength and ductility are obtained in 1.5 wt.% RE containing alloy in as-cast state. After heat treatment, the 1.0 wt.% RE containing alloy attains superior tensile strength. The differences in tensile strength are related to the morphology, distribution of second phases and solid-solution strengthening in different alloy systems. In addition, the fracture pattern of the alloy is predominantly brittle cleavage and tends to be quasi-cleavage with RE addition. (C) 2010 Elsevier B.V. All rights reserved.