Effect of the long periodic stacking structure and W-phase on the microstructures and mechanical properties of the Mg-8Gd-xZn-0.4Zr alloys
Effect of the long periodic stacking structure and W-phase on the microstructures and mechanical properties of the Mg-8Gd-xZn-0.4Zr alloys
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DOI：
10.1016/j.matdes.2009.06.030
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发表时间：
2010-01-01
影响因子：
8.4
通讯作者：
Meng, Jian
中科院分区：
文献类型：
--
作者：
Liu, Ke;Zhang, Jinghuai;Meng, Jian
研究了Mg-8Gd-xZn-0.4Zr （x = 0,1和3wt .%）合金在铸态和挤压态下的组织和力学性能。结果表明：铸态含锌合金中14H长周期堆积组织和w相同时存在；w相的体积分数随Zn添加量的增加而增加。这一相是断裂的裂纹源。在挤压的含锌合金中观察到6H长周期堆积结构。Mg-8Gd-1Zn-0.4Zr合金的延伸率最高，300℃时的延伸率为130%。w相通过抑制晶粒在高温下的运动，对提高材料的力学性能起着重要作用。2009爱思唯尔有限公司版权所有。
Microstructures and mechanical properties of the Mg-8Gd-xZn-0.4Zr (x = 0, 1 and 3 wt.%) alloys, in the as-cast condition and the as-extruded condition, have been investigated. The results show that both the 14H long periodic stacking structure and the W-phase coexist together in the cast Zn-containing alloys. The volume fraction of the W-phase increases with increasing the addition of Zn. This phase is the crack source of the fracture. The 6H long periodic stacking structure is observed in the extruded Zn-containing alloys. The Mg-8Gd-1Zn-0.4Zr alloy exhibits the highest elongation, and the value of its elongation is 130% at 300 degrees C due to the refined microstructure. The W-phase plays an important role in improving the mechanical properties via pinning the movement of the grains at elevated temperature. (C) 2009 Elsevier Ltd. All rights reserved.