Activation of dislocations in Mg with solute Y  

作　　者：Alireza Maldar Leyun Wang Boyu Liu Wenjun Liu Zhaohui Jin Bijin Zhou Xiaoqin Zeng 

机构地区：[1]National Engineering Research Center of Light Alloy Net Forming,Shanghai Jiao Tong University,Shanghai 200240,China [2]State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China [3]Advanced Photon Source,Argonne National Laboratory,IL 60439,USA [4]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,72 Wenhua Road,Shenyang 110016,China [5]School of Mechanical Engineering,Suzhou University of Science and Technology,Suzhou 215009,China

出　　处：《Journal of Magnesium and Alloys》2024年第3期1045-1053,共9页镁合金学报（英文）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 51671127, 51631006, 51971168);sponsored by the Shanghai Rising-Star Program;supported by the United States Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02–06CH11357

摘　　要：Mg-Y cast alloy shows excellent ductility(elongation to failure>15%)compared with pure Mg and commercial Mg cast alloys.By monitoring the microstructure evolution during an in situ tensile test of a Mg-2.5 wt%Y alloy,we identify the activation of prismatic<c>slip,which is rare in Mg.Synchrotron X-ray micro-beam Laue diffraction(μ-Laue)and transmission electron microscopy revealed the morphology of prismatic<c>slip bands and individual<c>dislocations.Density functional theory and molecular dynamics calculations indicate that solute Y can significantly reduce the stacking fault energy(SFE)along<c>direction on prismatic plane in Mg lattice and thus facilitate the nucleation of<c>dislocations during deformation.The presence of free<c>dislocations in the Mg lattice can also lead to nucleation of{10–12}twins even under unfavorable geometric conditions.

关 键 词：ALLOY MICROSTRUCTURE DUCTILITY 

分 类 号：TG292[金属学及工艺—铸造]