文献类型：期刊文献

英文题名：Low-cycle fatigue behaviour of Mg-9Gd-4Y-2Zn-0.5Zr alloys with different structures

作者：Ji, Jinsheng[1];Zheng, Jie[1];Jia, Leichen[1];Zhang, Yong[2];Jia, Yunfei[2];Shi, Yusha[1];Zhang, Heng[1];Xue, Yong[1]

机构：[1]North Univ China, Sch Mat Sci & Engn, Taiyuan 030051, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China

年份：2023

卷号：11

期号：9

起止页码：3382

外文期刊名：JOURNAL OF MAGNESIUM AND ALLOYS

收录：;EI(收录号：20221912071733);WOS:【SCI-EXPANDED(收录号:WOS:001107131000001)】；

基金：The authors are grateful for the supports provided by the National Natural Science Foundation of China (Grant No. 52075501) . "XX supporting scientific research project" (xxxx-2019-021) and JCKY2018408B003, Magnesium alloy high-performance XXX multi-directional extrusion technology.

语种：英文

外文关键词：Strain-controlled fatigue; Bimodal structure; Fractography; Mg-Gd-Y-Zn-Zr alloy.

摘要：The strain-controlled cyclic deformation behaviour of Mg-9Gd-4Y-2Zn-0.5Zr with different structures was investigated. Alloys were prepared by solution, extrusion and pre-ageing extrusion, and the microstructures before and after the fatigue tests were characterized. Experimental results indicated that the bimodal structure owned the better performance in fatigue test, which was attributed to the higher yield strength. For the equiaxed structure, cyclic hardening induced stress concentration until the failure. Stable cyclic deformation and persistent cyclic softening played an important role at the low and high strain amplitudes, respectively. This was attributed to the formation of fine grains relieving the stress concentration during cyclic loading. In addition, residual twins were observed in equiaxed structure to induce crack, and the bimodal structure effectively restrain it. (c) 2022 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University