Dislocations-induced precipitates and their effect on mechanical properties of Mg-Gd-Y-Zr alloy  

作　　者：Chao You Churning Liu Yingchun Wan Bei Tang Bizheng Wang Yonghao Gao Xiuzhu Han 

机构地区：[1]School of Materials Science and Engineering,Central South University,Changsha 410083,China [2]School of Materials Science and Engineering,Hunan University of Science and Technology,Xiangtan 411201,China [3]Beijing Institute of Spacecraft System Engineering,Beijing 100094,China

出　　处：《Journal of Magnesium and Alloys》2019年第3期414-418,共5页镁合金学报（英文）

基　　金：The authors are grateful to the financial support from the National Basic Research Program of China(Grant no.2013 CB632200);the National Natural Science Foundation of China(Grant no.51574291);the Fund amental Research Funds for the Central Universities of Central South University(Grant no.502220002).

摘　　要：Optical microscope(OM),scanning electron microscope(SEM),transmission electron microscope(TEM)and tensile machine were used to characterize the microstructures and mechanical properties of as-forged and aged Mg-9.5Gd-3.8Y-0.6Zr alloys.The results show that a novel kind of dislocation arrays,comprising parallel arranged dislocations,were obtained in the forged alloy.The arrays tend to extend parallel and are heterogeneously distributed with adjacent distances varying from 0.3μm to 1.4μm.After aging the alloy at 265°C,a large number of preferential-oriented phases were precipitated on the dislocation arrays,forming a structure of"precipitation chains"(PCs),which results in simultaneous increments of strength and ductility.

关 键 词：Magnesium alloys Dislocations PRECIPITATE Mechanical property 

分 类 号：TG1[金属学及工艺—金属学]