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设计AZ91层合板以实现强韧性结合

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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.
Tailoring AZ91 laminates for combination of strength and ductility
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.

AZ91 Mg alloysolid solution treatmentagingextrusionmechanical properties

陈祥、王玮璋、张军磊、黄光胜、刘帅帅、汤爱涛、蒋斌、潘复生

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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

AZ91镁合金 固溶处理 时效 挤压 力学性能

authors are grateful for the financial supports from the National Natural Science Foundation of Chinaauthors are grateful for the financial supports from the National Natural Science Foundation of China

52071035U1764253

2021

10.1016/S1003-6326(21)65758-8

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(12)
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