文献类型：期刊文献

英文题名：Anomalous effect of grain size on the room-temperature bendability of Mg-Gd alloy sheet

作者：He, Chao[1];Yuan, Ming[1,3];Jiang, Bin[1,2];Liu, Lintao[1];Wang, Qinghang[4];Chai, Yanfu[5];Liu, Wenjun[6];Huang, Guangsheng[1];Zhang, Dingfei[1];Pan, Fusheng[1,2]

机构：[1]Chongqing Univ, Coll Mat Sci & Engn, State Key Lab Mech Transmiss, Chongqing 400044, Peoples R China;[2]Chongqing Univ, Natl Engn Res Ctr Magnesium Alloys, Chongqing 400044, Peoples R China;[3]Hubei Engn Univ, Sch Chem & Mat Sci, Xiaogan 432000, Peoples R China;[4]Yangzhou Univ, Sch Mech Engn, Yangzhou 225127, Jiangsu, Peoples R China;[5]Shaoxing Univ, Sch Mech & Elect Engn, Shaoxing 312000, Peoples R China;[6]Chongqing Univ Technol, Coll Mat Sci & Engn, Chongqing 400054, Peoples R China

年份：2022

卷号：832

外文期刊名：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录：SCI-EXPANDED(收录号：WOS:000733392000001)、、EI(收录号：20215011319155)、Scopus(收录号：2-s2.0-85120894748)、WOS

基金：The authors are grateful for the financial supports from the National Natural Science Foundation of China (U1764253, 51971044, U1910213, 52001037, U2037601) and Qinghai Scientific & Techno-logical Program (2018-GX-A1) , Natural Science Foundation of Chongqing (Project No. cstc2019jcyj-msxmX0234, the Chongqing Sci-ence and Technology Commission (cstc2020jcyj-msxmX0184, cstc2019jscx-mbdxX0031, cstc2019jcyj-bshX0031) , and Chongqing University of Technology.

语种：英文

外文关键词：Mg-2Gd alloy; Grain size; Microstructure; Microcracks; Bendability

外文摘要：In this work, grain size impacted on the bendability of the Mg-2Gd (wt. %) alloy sheets was investigated. The microstructures and textures evolution during the bending test were analyzed by the electron back-scattered diffraction (EBSD) and the scanning electron microscopy (SEM) technique. The results showed an anomalous grain size-dependent bendability in this alloy. The coarser grain size sample corresponded to a poorer bendability in the Mg-Gd alloys, which was dramatically different from the traditional Mg alloys (such as AZ31B alloys). This opposite mode between the Mg-Gd and traditional rare earth (RE) free Mg alloys was mainly attributed to the difference of microcracks nucleation mechanism during the bending test. The nucleation sites of microcracks were almost in the grain boundaries for the Mg-Gd alloys, while in the intragranular for the traditional Mg alloys. Furthermore, the larger size of initial microcracks and the more heterogeneous strain distributions in the coarser grain Mg-Gd samples led to a premature failure in the bending process and gave rise to this anomalous grain size-dependent bendability.