Effect of long-period stacking ordered structure on very high cycle fatigue properties of Mg-Gd-Y-Zn-Zr alloys

作     者：Xiangyu WANG Chao HE Xue Li Lang LI Yongjie LIU Qingyuan WANG Xiangyu WANG;Chao HE;Xue Li;Lang LI;Yongjie LIU;Qingyuan WANG

作者机构：Key Laboratory of Deep Earth Science and EngineeringMinistry of EducationCollege of Architecture and EnvironmentSichuan UniversityChengdu 610065China Failure Mechanics&Engineering Disaster Prevention and MitigationKey Laboratory of Sichuan ProvinceSichuan UniversityChengdu 610065China School of Architecture and Civil EngineeringChengdu UniversityChengdu 610106China 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2023年第11卷第8期

页      面：2811-2822页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China(Nos.12072212 and 11832007) the National Key Research and Development Program of China(No.2018YFE0307104) the Applied Basic Research Programs of Sichuan Province(No.2021YJ0071).We also highly appreciate the help of Dr.Yan Li from the Department of Mechanics,Sichuan University 

主　　题：Fatigue crack initiation Long-period stacking ordered structure Mg alloys Ultrafine grains Very high cycle fatigue 

摘      要：Magnesium alloys with a long-period stacking ordered(LPSO)structure usually possess excellent static strength,but their fatigue behaviors are poorly *** work presents the effect of the LPSO structure on the crack behaviors of Mg alloys in a very high cycle fatigue(VHCF)*** LPSO lamellas lead to a facet-like cracking process along the basal planes at the crack initiation site and strongly prohibit the early crack propagation by deflecting the growth *** stress intensity factor at the periphery of the faceted area is much higher than the conventional LPSO-free Mg alloys,contributing higher fatigue crack propagation threshold of LPSO-containing Mg *** observation at the facets reveals a layer of ultrafine grains at the fracture surface due to the cyclic contact of the crack surface,which supports the numerous cyclic pressing model describing the VHCF crack initiation behavior.