| AZ31B镁合金双道次热变形过程流变应力特征模拟研究 |
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| 引用本文： | 邓小虎,胡小东,赵红阳,巨东英.AZ31B镁合金双道次热变形过程流变应力特征模拟研究[J].航空材料学报,2017,37(3). |
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| 作者姓名： | 邓小虎 胡小东 赵红阳 巨东英 |
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| 作者单位： | 1. 天津职业技术师范大学 天津市高速切削与精密加工重点实验室,天津 300222;天津职业技术师范大学 天津市模具数字化制造技术工程中心, 天津 300222;2. 辽宁科技大学 材料科学与工程学院,辽宁 鞍山,114051;3. 日本埼玉工业大学 先端科学研究所,埼玉 深谷 369-0293 |
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| 基金项目： | 天津科技创新体系及平台建设计划，天津市高等学校创新团队培养计划 |
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| 摘 要： | 建立了一类镁合金双道次热变形过程的二维元胞自动机模型。考虑到镁合金具有六重对称的密排六方晶体结构,模型采用了六边形元胞网格。另外,通过计算位错密度演变和设定晶粒形核长大规则,模型将热变形过程中动态再结晶、静态回复、静态再结晶、亚动态再结晶和晶粒长大等单个物理过程耦合到一起。为了验证模型,将其应用到AZ31B镁合金单道次和双道次热压缩过程。探讨了不同变形温度、应变速率、道次间隔和预应变对应力-应变曲线的影响。将计算结果和实验结果进行了对比,吻合较好。
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| 关 键 词： | AZ31B 双道次热压缩 流变应力特征 元胞自动机 |
Simulation of Flow Stress Characteristic During Two-stage Hot Deformation Process in AZ31B Magnesium Alloy |
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| Abstract: | A 2-D CA model has been developed to simulate two-stage hot deformation processing of magnesium (Mg) alloy.Based on the fact that Mg has an HCP crystal structure with six-fold symmetry,the model employs hexagonal CA lattice.The physically-based model has integrated the effects of individual metallurgical phenomena related with the hot deformation,including dynamic recrystallization (DRX),static recovery,static recrystallization (SRX),meta-dynamic recrystallization (MDRX) and grain growth,etc.The model is validated by simulating single-stage and two-stage hot compression tests of AZ31B.The effects of temperature,strain rate,the interval and pre-strain on stress-strain curves are investigated.The calculated results are compared with the available experimental findings in AZ31B Mg alloy,and the simulated results agree well with the experimental results and theoretical models. |
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| Keywords: | AZ31B two-stage hot compression flow stress characteristic cellular automaton |
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