首页|AZ31B镁合金板材中晶界滑移的晶体塑性仿真

AZ31B镁合金板材中晶界滑移的晶体塑性仿真

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建立一种耦合滑移、动态再结晶以及晶界滑移的晶体塑性模型以仿真镁合金的高温变形行为及织构演化.首先,通过实验测量单轴拉伸、压缩后的织构以及显微组织演化,研究AZ31B镁合金在300°C的变形机制.结果发现,动态再结晶在应变小于0.2时起到细化晶粒的作用,之后晶界滑移在变形过程中起显著作用.此外,建立晶界滑移模型来评估由晶界滑移产生的应变以及晶粒转动,并与多晶体塑性模型VPSC相耦合.所建立的VPSC-DRX-GBS模型可以很好地计算应力−应变曲线、晶粒尺寸、织构演化以及实验中所发现的拉伸与压缩织构演化显著差异.计算的晶界滑移贡献率在拉伸条件下显著高于压缩条件的,这是由于在拉伸时晶界上更易产生孔洞形核.
Crystal plasticity based modeling of grain boundary sliding in magnesium alloy AZ31B sheet
The aim of present work is to develop a crystal plasticity modeling approach to integrate slip, dynamic recrystallization (DRX) and grain boundary sliding (GBS) for simulating the deformation behavior and texture evolution of magnesium alloys at high temperatures. Firstly, the deformation mechanisms of an AZ31B Mg alloy sheet at 300 °C were investigated by examining texture and microstructure evolution during uniaxial tension and compression tests. DRX refines microstructure at strains less than 0.2, and subsequently GBS plays a significant role during deformation process. A GBS model is developed to evaluate strain and grain rotation induced by GBS, and implemented into the polycrystal plasticity framework VPSC. The VPSC-DRX-GBS model can well reproduce the stress−strain curves, grain size, texture evolution and significant texture differences in tension and compression tests due to GBS. The calculated GBS contribution ratio in tension is obviously higher than that in compression due to easier cavity nucleation at grain boundaries under tension loading.

magnesium alloysgrain boundary slidingdynamic recrystallizationpolycrystal plasticitytexture

李子涵、周国伟、李大永、汪华苗、唐伟琴、彭颖红、Hatem S.ZUROB、吴沛东

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上海交通大学机械系统与振动国家重点实验室,上海 200240

Department of Materials Science and Engineering,Ohio State University,Columbus,Ohio 43212,USA

上海交通大学材料基因组联合研究中心,上海 200240

Department of Materials Science and Engineering,McMaster University,Hamilton,Ontario L8S 4G7,Canada

Department of Mechanical Engineering,McMaster University,Hamilton,Ontario L8S 4G7,Canada

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镁合金 晶界滑移 动态再结晶 多晶体塑性 织构

authors would like to acknowledge the support from the National Natural Science Foundation of Chinaauthors would like to acknowledge the support from the National Natural Science Foundation of ChinaMajor Projects of the Ministry of EducationPei-dong WU would like to acknowledge the support from the Natural Sciences and Engineering Research Council of CanadaPei-dong WU would like to acknowledge the support from the Natural Sciences and Engineering Research Council of Canada

5167533151775337311017NSERCRGPIN-2016-06464

2021

10.1016/S1003-6326(20)65483-8

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(1)
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