The tribological behavior of a surface-nanocrystallized magnesium alloy AZ31 sheet after ultrasonic shot peening treatment  

作　　者：Jianyue Zhang Yongxin Jian Xuzhe Zhao Dean Meng Fusheng Pan Qingyou Han 

机构地区：[1]School of Engineering Technology,Purdue University,West Lafayette,IN 47906,USA [2]State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,PR China [3]Böllhoff Inc,Troy,MI 48084,USA [4]School of Automobile,Chang’an University,Xi’an 710064,PR China [5]College of Materials Science and Engineering,Chongqing University,Chongqing 400045,PR China

出　　处：《Journal of Magnesium and Alloys》2021年第4期1190-1203,共14页镁合金学报（英文）

摘　　要：A magnesium alloy AZ31 sheet was processed by ultrasonic shot peening treatment to fabricate a surface nanocrystalline,and a ball-on-disk dry sliding wear test was performed to evaluate the tribological behavior after treatment.The microstructure observation indicated a gradient nanocrystalline structure was formed after USSP treatment.The microhardness at the top surface was improved from 60 HV to 145 HV after treatment.The formed nanocrystalline resulted in an easy formation of MgO patches on the surface and reduced the coefficient of friction.Moreover,the formed nanocrystalline leaded to a retard of delamination with increasing the sliding speed and applied load,which was due to its stronger sub-surface.Under high sliding speed(0.5 m/s)and high applied load(50 N),it was firstly found that the formed nanocrystalline prevented the happening of thermal softening and melting.The possible reasons accounting for the prevention of thennal softening and melting were discussed accordingly.

关 键 词：AZ31Mg alloy Ultrasonic shot peening Surface-nanocrystallization Wear mechanism 

分 类 号：U466[机械工程—车辆工程] TG668[交通运输工程—载运工具运用工程] TG146.22[交通运输工程—道路与铁道工程]