Mg-Zn-Gd板材在Erichsen杯突试验过程中的组织演变和变形机理  

Microstructure evolution and deformation mechanism of Mg−Zn−Gd sheet during Erichsen cupping test

作　　者：陈勇 闫宏[1,3] 王丹[4] 陈荣石 Yong CHEN;Hong YAN;Dan WANG;Rong-shi CHEN(Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China;AECC Shenyang Liming Aero-Engine Co.,Ltd.,Shenyang 110043,China)

机构地区：[1]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016 [2]中国科学技术大学材料科学与工程学院,沈阳110016 [3]山东科技大学材料科学与工程学院,青岛266590 [4]中国航发沈阳黎明航空发动机有限责任公司,沈阳110043

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第3期728-742,共15页中国有色金属学报（英文版）

基　　金：financially supported by the Natural Science Foundation of Liaoning Province,China(No.2020-MS-004);the National Natural Science Foundation of China(Nos.51601193,51701218);the National Key Research and Development Program of China(No.2016YFB0301104);the State Key Program of National Natural Science of China(No.51531002);the Natural Science Foundation of Shandong Province,China(No.ZR2021ME241)。

摘　　要：对GZ31板材在室温和不同压下量条件下进行Erichsen杯突试验,获得4个杯突值分别为2.0、4.1、7.1和7.3 mm的样品。利用OM、SEM和EBSD技术手段研究杯突试验时样品的变形机理和断裂机理。结果表明,非基面织构的GZ31轧制板材杯突值可达7.3 mm。在杯突过程中,基面、锥面滑移以及{10■2}拉伸孪生是主要的变形方式。位错滑移受到第二相颗粒以及晶界阻碍,相互缠结形成微孔,最后导致材料的断裂。GZ31板材杯突值高是因为弱的非基面织构以及稀土元素有利于位错滑移和拉伸孪生去协调变形。An Erichsen cupping test of GZ31 sheet at room temperature with different reductions was carried out,and four samples with IEs(Erichsen index)of 2.0,4.1,7.1,and 7.3 mm were obtained.The deformation and fracture mechanisms of the cupping deformation process were studied by OM,SEM and EBSD.The results show that the IE of the GZ31 rolled sheet with the non-basal texture can reach 7.3 mm.Basal and pyramidal dislocation slips and{10■2}extension twinning are the main deformation modes during the Erichsen cupping test.The dislocation slip is hindered by the second phase particles and grain boundaries and entangles with each other to form voids,which eventually leads to the fracture of the material.The reason for the GZ31 sheet showing high IE is that the weak non-basal texture and rare earth elements are favorable for dislocation slip and extension twining to coordinate deformation.

关 键 词：镁合金 Erichsen杯突试验 位错滑移 孪生 

分 类 号：TG146.22[一般工业技术—材料科学与工程]