The role of melt cooling rate on the interface between 18R and Mg matrix in Mg_(97)Zn_(1)Y_(2) alloys

作     者：Q.Q.Jin X.H.Shao J.M.Li Z.Z.Peng M.Lv B.Zhang Y.M.Li X.L.Ma Q.Q.Jin;X.H.Shao;J.M.Li;Z.Z.Peng;M.Lv;B.Zhang;Y.M.Li;X.L.Ma

作者机构：Materials Science and Engineering Research CenterGuangxi University of Science and TechnologyLiuzhou 545006China Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuangHebei 050018China 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2023年第11卷第8期

页      面：2883-2890页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：This work is supported by the National Natural Science Foundation of China(grant number 51801214 and 51871222) Guangxi Science and Technology Base and Talents Special Project(Guike AD20297034) Liaoning Provincial Natural Science Foundation(2019-MS-335) Research Start-up Funding from Guangxi University of Science and Technology(No.03200150) Natural Science Foundation of Hebei Province of China(grant number E2020208083) 

主　　题：Magnesium alloys Long-period stacking ordered phases Dislocations Interface structure 

摘      要：The role of melt cooling rate on the interface morphology and dislocation configuration between 18R long-period stacking ordered(LPSO)structure and Mg matrix in Mg_(97)Zn_(1)Y_(2)(at.%)alloys was investigated by atomic-scale HAADF-STEM *** 18R/Mg interface is step-like both in the near-equilibrium alloy and non-equilibrium *** cooling rate makes the step size more regular and *** 54R structure can be observed at the interface in the near-equilibrium alloy,and the dislocations are highly ordered.54R and 54R′structure sandwiched by b1 and b2+b3 dislocation arrays,and new dislocation configuration can be detected at the interface in the non-equilibrium alloy,but the dislocations are less ordered.18R/Mg interface containing 54R or 54R′in equilibrium width,parallel to the(010)plane,should be most stable based on elastic *** segregation of solute atoms and its strong interaction with dislocations dominate the LPSO/Mg interface via diffusion-displacive transformation.