Tailoring strength-ductility balance of caliber-rolled AZ31 Mg alloy through subsequent annealing  

作　　者：Taein Kong Byung Je Kwak Jonghyun Kim Jeong Hun Lee Sung Hyuk Park Ji Hoon Kim Young Hoon Moon Hyun Sik Yoon Taekyung Lee 

机构地区：[1]School of Mechanical Engineering,Pusan National University,Busan 46241,Republic of Korea [2]Advanced Forming Process R&D Group,Korea Institute of Industrial Technology,Ulsan 44413,Republic of Korea [3]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [4]School of Materials Science and Engineering,Kyungpook National University,Daegu 41566,Republic of Korea [5]Department of Naval Architecture and Ocean Engineering,Pusan National University,Busan 46241,Republic of Korea

出　　处：《Journal of Magnesium and Alloys》2020年第1期163-171,共9页镁合金学报（英文）

基　　金：This work was supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)through GCRC-SOP(No.2011-0030013).

摘　　要：Recently,multi-pass caliber rolling has been shown to be effective for Mg alloys.This study investigated the effect of subsequent annealing on the mechanical properties of a caliber-rolled AZ31 Mg alloy to modulate the strength-ductility relationship.This annealing gave rise to different trends in mechanical properties depending on the temperature regime.Low-temperature annealing(T≤473 K)exhibited a typical trade-off relationship,where an increase in annealing temperature resulted in increased ductility but decreased strength and hardness.Such a heat treatment did not degrade the high strength-ductility balance of the caliber-rolled alloy,suggesting that the mechanical properties could be tailored for different potential applications.In contrast,high-temperature annealing(T>473 K)caused a simultaneous deterioration in strength,hardness,and ductility with increasing annealing temperature.These differences are discussed in terms of the varying microstructural features under the different investigated annealing regimes.

关 键 词：AZ31 Mg alloy Caliber rolling ANNEALING Grain growth Mechanical improvement TWINNING 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG156.2[金属学及工艺—金属材料]