Achieving high-strain-rate and low-temperature superplasticity in an ECAP-processed Mg-Y-Er-Zn alloy via Ag addition  

作　　者：Haoran Wu Jinghua Jiang Zhenquan Yang Mengjia Li He Huang Ningfei Ge Aibin Ma Huan Liu 

机构地区：[1]College of Mechanicals and Materials,Hohai University,Nanjing 210000,China [2]Suqian Institute,Hohai University,Suqian 223800,China [3]Center of Advanced Analysis and Gene Sequencing,Zhengzhou University,Zhengzhou 450003,China [4]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450003,China [5]Faculty of Georesources and Materials Engineering,RWTH Aachen University,52062,Germany

出　　处：《Journal of Magnesium and Alloys》2023年第10期3765-3778,共14页镁合金学报（英文）

基　　金：supported by the Postgraduate Research and Practice Innovation Program of Jiangsu Province (SJKY19_0460);the National Natural Science Foundation of China (Grant No.51979099 & 51774109);Natural Science Foundation of Jiangsu Province of China (Grant No.BK20191303);The Key Research and Development Project of Jiangsu Province of China (Grant No.BE2017148);Postgraduate Education Reform Project of Jiangsu Province (JGLX19_027)。

摘　　要：The effect of adding a small amount of Ag on the microstructure evolution and superplastic properties of Mg-Y-Er-Zn(WEZ612) alloys was systematically studied.The basal texture of the refined WEZ612 alloy produced by equal channel angular pressing was altered to a non-basal structure upon the addition of Ag.Ag addition also refined the grain size and promoted the formation of a large number of nano-14H-long period stacking ordered phases.Using high-resolution transmission electron microscopy,many nano-precipitated phases were detected on the basal plane of the Mg-Y-Er-Zn-1Ag(WEZ612-1Ag) alloy,The nano-precipitated phases on the basal plane improved the thermal stability of the alloy,lowered the deformation activation energy(Q),and improved the stress sensitivity index(m).At 523 K with a strain rate of 10^(-2) s^(-1),the Q value of WEZ612 was higher than that of WEZ612-1Ag(299.14 and 128.5 kJ mol^(-1),respectively).In contrast,the m value of the WEZ612 alloy(0.16) was lower than that of the WEZ612-1Ag alloy(0.46).At 623 K with a tensile rate of 10^(-2) s^(-1),the WEZ612 and WEZ612-1Ag alloys were elongated by 182% and 495%,respectively,with the latter exhibiting high-strain-rate and low-temperature superplasticity.The improved superplasticity of the WEZ612-1Ag alloy is attributed to the nano-precipitated phases,which effectively limit the cavity extension during superplastic deformation.

关 键 词：Magnesium alloys Long period stacking ordered(LPSO) Ag addition Nano-precipitates Superplastic behavior 

分 类 号：TG146.22[一般工业技术—材料科学与工程]