Microstructure, tensile properties and creep behaviors of as-cast Mg-2Al-1Zn-xGd (x = 1, 2, 3, and 4 wt.%) alloys
Microstructure, tensile properties and creep behaviors of as-cast Mg-2Al-1Zn-xGd (x = 1, 2, 3, and 4 wt.%) alloys
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DOI：
10.1016/j.jallcom.2012.01.084
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发表时间：
2012-05
影响因子：
6.2
通讯作者：
Xu-dong Wang;W. Du;Ke Liu;Zhaohui Wang;Shu-bo Li
中科院分区：
文献类型：
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作者：
Xu-dong Wang;W. Du;Ke Liu;Zhaohui Wang;Shu-bo Li
研究了Mg-2Al-1Zn-xGd（x = 1，2，3，4wt. %）合金的铸态组织、拉伸性能和蠕变行为。研究了合金。结果表明，Gd的加入导致了（Mg，Al）3Gd枝晶相和Al2Gd立方相的形成。由于枝晶（Mg，Al）3Gd相的存在，AZ21合金的室温和高温拉伸性能都得到了很大的改善。Gd含量为4%的AZ21合金具有良好的抗蠕变性能。100h后合金的稳态蠕变区和总蠕变应变分别为2.6 × 10 − 8s − 1和1.2%。AZ21合金蠕变性能的提高主要归因于热稳定的枝状（Mg，Al）3Gd相有效地阻碍了位错的运动。
The microstructure, tensile properties and creep behaviors of as-cast Mg–2Al–1Zn–xGd (x=1, 2, 3, and 4wt.%) alloys have been investigated. The results indicated that the addition of Gd led to the formation of a branched (Mg, Al)3Gd phase and a cubic Al2Gd phase. The tensile properties of the AZ21 alloy have been improved greatly at both room temperature and elevated temperature due to the presence of the branched (Mg, Al)3Gd phase. The AZ21 alloy containing 4% Gd presented a good creep-resistant property. The steady-region and the total creep strain of the alloy after 100h were 2.6×10−8s−1and 1.2%, respectively. The enhancement of creep properties of the AZ21 alloy was mainly ascribed to the thermal stable branched (Mg, Al)3Gd phase by which the movement of dislocations were impeded effectively.