A pathway to improve low-cycle fatigue life of face-centered cubic metals via grain boundary engineering  

作　　者：X.J.Guan Z.P.Jia S.M.Liang F.Shi X.W.Li 

机构地区：[1]Department of Materials Physics and Chemistry,School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [2]State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China [3]Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China

出　　处：《Journal of Materials Science & Technology》2022年第18期82-89,共8页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(Nos.51871048 and 52171108);the Fundamental Research Funds for the Central Universities under(No.N2002014).

摘　　要：To probe a pathway to improve the low-cycle fatigue life of face-centered cubic(FCC)metals via grain boundary engineering(GBE),the tension-tension fatigue tests were carried out on the non-GBE and GBE Cu-16 at.%Al alloys at relatively high stress amplitudes.The results indicate that the cyclic strain localiza-tion and cracking at grain boundaries(GBs)can be effectively suppressed,especially at increased stress amplitude,by an appropriate GBE treatment that can result in a higher resistance to GB cracking and a greater capability of compatible deformation.Therefore,the sensitivity of fatigue life to stress amplitude can be weakened by GBE,and the low-cycle fatigue life of Cu-16 at.%Al alloys is thus distinctly improved.

关 键 词：Cu-Al alloy Grain boundary engineering Fatigue life Crack nucleation Stress amplitude 

分 类 号：TG146.21[一般工业技术—材料科学与工程]