Utilization of surface nanocrystalline to improve the bendability of AZ31 Mg alloy sheet  

作　　者：Jianyue Zhang Xuzhe Zhao De'an Meng Qingyou Han 

机构地区：[1]Department of Materials Science and Engineering,The Ohio State University,Columbus,OH 43210,USA [2]Arnold Fastening System Inc,MI 48084,USA [3]School of Automobile,Chang’an Univeristy,Xi’an 710064,China [4]School of Engineering Technology,Purdue University,West Lafayette,IN 47906,USA

出　　处：《International Journal of Minerals,Metallurgy and Materials》2022年第7期1413-1424,共12页矿物冶金与材料学报（英文版）

基　　金：financially supported by the Natural Science Basic Research Program of Shaanxi,China(No.2021JQ-250);the Fundamental Research Funds for the Central Universities(No.300102220301)。

摘　　要：A surface nanocrystalline was fabricated by ultrasonic shot peening(USSP)treatment at AZ31 Mg alloy.The effect of nanocrystalline thickness and its placed side(external or internal)on the bendability was studied by a V-bending test.Three durations,5,10,and 15 min,were applied to form the surface nanocrystalline with thicknesses of 51,79,and 145μm,respectively.Two-side treatment led to a similar bendability as that of as-received.One-side internal treatment for 5 min resulted in an improved bendability while the improvement was limited and degenerated for longer treatment.The improvement was related to the drawing back of the neutral axis.The one-side external treatment also improved the bendability,and the improvement was due to the redistribution of strain and stress during bending.With nanocrystalline at external side,it resulted in a larger stress but a smaller strain at the convex,which prevented the happening of crack during bending.

关 键 词：AZ31 magnesium alloy ultrasonic shot peening surface nanocrystalline BENDABILITY neutral axis 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TG146.22[金属学及工艺—金属材料]