Transactions of Materials and Heat Treatment

Title：Dislocation slip transfer phenomenon for Mg-Gd-Y-Zn Mg-RE alloy

Authors：

Unit：

KeyWords：

ClassificationCode：TG146.4

year,vol(issue):pagenumber：2022,47(7):253-260

Abstract：

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.

Funds：

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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