Twinning-Induced Abnormal Strain Rate Sensitivity and Indentation Creep Behavior in Nanocrystalline Mg Alloy
发布时间：2022-06-10
点击次数：
DOI码：10.3390/ma14227104
发表刊物：Materials
关键字：Mg alloy; nanocrystalline; nanoindentation; strain rate sensitivity; creep
摘要：Nanocrystalline materials exhibit many unique physical and chemical properties with respect to their coarse-grained counterparts due to the high volume fraction of grain boundaries. Research interests on nanocrystalline materials around the world have been lasting over the past decades. In this study, we explored the room temperature strain rate sensitivity and creep behavior of the nanocrystalline Mg-Gd-Y-Zr alloy by using a nanoindentation technique. Results showed that the hardness and creep displacements of the nanocrystalline Mg-Gd-Y-Zr alloy decreased with increasing loading strain rate. That is, the nanocrystalline Mg-Gd-Y-Zr alloy showed negative strain rate sensitivity and its creep behavior also exhibited negative rate dependence. It was revealed that the enhanced twinning activities at higher loading strain rates resulted in reduced hardness and creep displacements. The dominant creep mechanism of the nanocrystalline Mg-Gd-Y-Zr alloy is discussed based on a work-of-indentation theory in this paper.
合写作者：Y.C. Wan*, C.M. Liu, Z.Y. Chen, X.Y. Zhou*
第一作者：S.L. Yu
论文类型：期刊论文
文献类型：J
卷号：14
期号：22
页面范围：7104
是否译文：否
发表时间：2021-11-22