Revealing the role of pyramidal slip in the high ductility of Mg-Li alloy  

作　　者：Jing Xu Bo Guan Yunchang Xin Guangjie Huang Peidong Wu Qing Liu 

机构地区：[1]International Joint Laboratory for Light Alloys,College of Materials Science and Engineering,Chongqing University,Chongqing 400030,China [2]Key Laboratory for Light-weight Materials,Nanjing Tech University,Nanjing 210009,China [3]Department of Mechanical Engineering,McMaster University,Hamilton,ON L8S 4L7,Canada

出　　处：《Journal of Magnesium and Alloys》2024年第3期1021-1025,共5页镁合金学报（英文）

基　　金：support from National Natural Science Foundation of China(51871032,52071039 and 51671040);Natural Science Foundation of Jiangsu Province(BK20202010);“111”Project by the Ministry of Education(B16007).

摘　　要：The high ductility of Mg-Li alloy has been mainly ascribed to a high activity of pyramidal<c+a>slip to accommodate plastic strain.In the present study,however,a quantitative analysis reveals that Li-addition can only slightly stimulate the activation of pyramidal<c+a>slip under compression along the normal direction of a hot-rolled Mg-4.5 wt.%Li plate,with a relative activity of approximately 18%.Although the limited activity of pyramidal<c+a>slip alone cannot accommodate a large plastic strain,it effectively reduces the number of{10.11}−{10.12}double twins,which are believed to be favorable sites for crack initiation.The evidently reduced activity of double twins leads to a lower cracking tendency,and therefore improves ductility.

关 键 词：Mg alloy Plasticity Plastic deformation SLIP Twinning. 

分 类 号：TG146.22[一般工业技术—材料科学与工程]