锻压技术

Mg-Gd-Y-Zn稀土镁合金中的位错滑移转移现象

英文标题：Dislocation slip transfer phenomenon for Mg-Gd-Y-Zn Mg-RE alloy

作者：马文昌蒋少松

分类号：TG146.4

出版年,卷(期):页码：2022,47(7):253-260

摘要：

通过原位拉伸对Mg-Gd-Y-Zn稀土镁合金中位错在相邻晶粒内的滑移转移现象进行了研究。使用Luster-Morris因子m′评估相邻两个晶粒内滑移系之间的几何关系。研究发现，Mg-Gd-Y-Zn稀土镁合金中裂纹更容易在硬取向和软取向晶粒的交界处形成。对实验结果进行统计分析后发现，位错滑移转移发生时，相邻晶粒滑移系的m′大于0.77。当晶界取向差小于34.2°时，发生基面位错-基面位错滑移转移现象；当晶界取向差大于48.8°时，发生基面位错-锥面位错滑移转移现象。此外，研究发现，m′与基面滑移系的Schmid因子相乘，可以定量地判断基面位错-基面位错的滑移转移现象，而对于基面位错-锥面位错的滑移转移现象，m′与Schmid因子相乘的方法并不适用。

In Mg-Gd-Y-Zn Mg-RE alloy, the dislocations slip transfer phenomenon in adjacent grains was investigated by in-situ tension test, and the geometric relationship between the slip systems in two adjacent grains was evaluated by Luster-Morris factor m′. It is found that cracks in Mg-Gd-Y-Zn Mg-RE alloy are more likely to form at the junction of hard-oriented and soft-oriented grains. After the statistical analysis on the test results, it is found that when the dislocation slip transfer phenomenon occurs, m′ of the adjacent grain slip system should be larger than 0.77. When the grain boundary misorientation is less than 34.2°, the basal plane dislocation-basal plane dislocation slip transfer phenomenon occurs, whereas when the grain boundary misorientation is larger than 48.8°, the basal plane dislocation-cone dislocation slip transfer phenomenon occurs. In addition, it is found that the multiplication of m′ and Schmid factor of the basal plane slip system can quantitatively determine the basal plane dislocation-basal plane dislocation slip transfer phenomenon. For the slip transfer phenomenon of basal plane dislocations-cone dislocations, the method of multiplying m′ factor by the Schmid factor is not applicable.

基金项目：

国家自然科学基金资助项目(51775135，U1830119)

作者简介：马文昌（1973-），男，学士，高级工程师 E-mail:wchangma@126.com 通信作者：蒋少松（1978-），男，博士，研究员 E-mail:jiangshaosong@hit.edu.cn

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