Tailoring AZ91 laminates for combination of strength and ductility  

设计AZ91层合板以实现强韧性结合

作　　者：Xiang CHEN Wei-zhang WANG Jun-lei ZHANG Guang-sheng HUANG Shuai-shuai LIU Ai-tao TANG Bin JIANG Fu-sheng PAN 陈祥;王玮璋;张军磊;黄光胜;刘帅帅;汤爱涛;蒋斌;潘复生(重庆大学材料科学与工程学院机械传动国家重点实验室,重庆400044;重庆大学国家镁合金工程研究中心,重庆400044)

机构地区：[1]State Key Laboratory of Mechanical Transmission,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [2]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第12期3703-3718,共16页中国有色金属学报（英文版）

基　　金：The authors are grateful for the financial supports from the National Natural Science Foundation of China(Nos.52071035,U1764253).

摘　　要：Three types of laminates were designed by alternately stacking AZ91 extruded sheets in different states for extrusion to improve the mechanical properties.The tensile tests revealed that the combination of solid-solution-treated sheets with the aging-treated sheets achieved high tensile strength and ductility,i.e.,ultimate tensile strength of~386 MPa and elongation of~19.8%,respectively.Electron backscatter diffraction(EBSD)and TEM results indicated that the aging-treated layers with more nano-sized precipitates and small grain size provided high strength and reasonable ductility,while the solid-solution-treated layers with low dislocation density facilitated strain hardening.Also,the strong interface bonding between the successive layers played an important role in the enhanced ductility.通过交替堆叠不同状态下的AZ91挤压板设计三种类型的层合板,以改善其力学性能。拉伸试验表明,固溶处理后的板材与时效处理后的板材相结合,可获得较高的抗拉强度和塑性,即极限抗拉强度和伸长率分别约为386MPa和19.8%。电子背散射衍射(EBSD)和透射电镜(TEM)结果表明,时效处理层中析出的纳米颗粒较多,晶粒尺寸较小,具有较高的强度和合理的塑性,而固溶处理层中位错密度较低,有利于应变硬化。此外,连续层间的强界面结合对延展性的提高起着重要作用。

关 键 词：AZ91 Mg alloy solid solution treatment aging extrusion mechanical properties 

分 类 号：TG146.22[一般工业技术—材料科学与工程]