| 铸态Mg-6Zn-2Er合金的室温拉伸失效机制 |
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| 引用本文： | 刘轲,王庆峰,杜文博,李淑波,王朝辉.铸态Mg-6Zn-2Er合金的室温拉伸失效机制[J].中国有色金属学会会刊,2013,23(11):3193-3199. |
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| 作者姓名： | 刘轲 王庆峰 杜文博 李淑波 王朝辉 |
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| 作者单位： | 北京工业大学材料科学与工程学院,北京100124 |
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| 基金项目： | Projects （51071004, 51101002） supported by the National Natural Science Foundation of China; Project （2011BAE22B01-3） supported by the National Science and Technology Supporting Plan during the 12th Five-Year Period, China |
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| 摘 要： | 在室温条件下进行了铸态Mg-6Zn-2Er合金的室温拉伸试验。结果表明，该合金的断裂伸长率为5．6％。粗大的第二相，特别是粗大的Mg3Zn3Er2相（W相）是合金失效断裂的主要原因。这表明W相不能有效地实现应力的传递，导致自身内部有裂纹产生。比较可知，合金的基体与第二相间的界面比较稳定，没有裂纹产生。因此，合金第二相的尺寸、分布、形貌和类型显著地影响合金的塑性变形行为。
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| 关 键 词： | Mg合金 Mg—Zn-Er合金 微观结构 力学性能 ∥相 裂纹 塑性变形 |
| 收稿时间： | 8 October 2012 |
Failure mechanism of as-cast Mg-6Zn-2Er alloy during tensile test at room temperature |
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| Ke LIU,Qing-feng WANG,Wen-bo DU,Shu-bo LI,Zhao-hui WANG.Failure mechanism of as-cast Mg-6Zn-2Er alloy during tensile test at room temperature[J].Transactions of Nonferrous Metals Society of China,2013,23(11):3193-3199. |
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| Authors: | Ke LIU Qing-feng WANG Wen-bo DU Shu-bo LI Zhao-hui WANG |
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| Affiliation: | School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | Tensile test of the as-cast Mg-6Zn-2Er alloy was conducted at room temperature. The results indicate that the alloy is inclined to failure when the strain reaches 5.6%. The coarse secondary phases are responsible for the failure, especially for the Mg3Zn3Er2 phase （W-phase）. It is indicated that the existence of the W-phase activates the stress concentrations due to the incapacity of W-phase for the load transfer, which results in the void at the inner of the W-phase. In comparison, the interface between the matrix and the secondary phase is stable. In conclusion, the characters of the secondary phases with respect to size, distribution, morphology and type, play an important role in the plastic deformation behavior of the alloy. |
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| Keywords: | Mg alloy Mg-Zn-Er alloy microstructure mechanical properties W-phase crack plastic deformation |
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