周洁,吴任东,袁朝龙,焦玮,李滔.不同工艺状态下AZ31B镁合金热压缩变形行为研究[J].稀有金属材料与工程,2020,49(5):1793~1798.[ZHOU Jie,WU Rendong,YUAN Chaolong,JIAO Wei,LI Tao.Deformation behavior research of AZ31B magnesium alloys with different process states under thermal compression[J].Rare Metal Materials and Engineering,2020,49(5):1793~1798.]
不同工艺状态下AZ31B镁合金热压缩变形行为研究
投稿时间:2019-04-08  修订日期:2019-04-22
中文关键词:  应力应变曲线  AZ31B镁合金  初始工艺状态  本构方程
基金项目:
中文摘要:
      镁合金在热加工过程中的变形机制复杂,且容易受到材料初始工艺状态和变形条件影响,因此呈现出不同的应力应变关系。采用铸态和变形态的AZ31B作为研究对象,通过Gleeble-1500获取坯料的应力应变曲线随温度和应变率的变化关系,基于Arrhenius双曲正弦型函数构建两种不同工艺状态下镁合金的本构模型,分析初始加工状态对镁合金应力应变关系及变形机制的影响。实验结果表明:当应变速率大于0.1s-1,变形态镁合金在低温下由于变形织构及大量孪生产生而出现45°剪切断裂;在高温和低应变速率下两种工艺状态的镁合金变形机制相同,应力应变曲线基本相似;变形态镁合金的硬化指数n及变形激活能Q相比铸态镁合金更低。
Deformation behavior research of AZ31B magnesium alloys with different process states under thermal compression
英文关键词:Stress-strain curves  AZ31B magnesium alloy  Initial process states  Constitutive equations
英文摘要:
      Deformation mechanism of magnesium alloys is complex and prone to be affected by initial process states and deformation conditions of materials during the thermal process, therefore, exhibits different stress-strain relationships. Stress-strain curves of casting and wrought magnesium alloys AZ31B were obtained by Gleeble-1500, and the constitutive models of magnesium alloys under two different initial process states were constructed based on the Arrhenius hyperbolic sine function, the effect of initial process states on stress-strain curves and deformation mechanism of magnesium alloy were analyzed. Experimental results show that wrought magnesium alloy appears shear fracture along 45° direction due to deformation texture and amounts of twins at low temperature when the strain rate is greater than 0.1s-1. However, The deformation mechanisms of casting and wrought magnesium alloys AZ31B keep the same at high temperatures and low strain rates, therefore, the stress-strain curves of them are basically similar. The hardening index n and activation energy Q of wrought magnesium alloys are smaller than casting magnesium alloys.
作者单位E-mail
周洁 清华大学先进成形制造技术教育部重点实验室 北京 清华大学机械工程系 北京 1659640564@qq.com 
吴任东 清华大学先进成形制造技术教育部重点实验室 北京 清华大学机械工程系 北京  
袁朝龙 清华大学先进成形制造技术教育部重点实验室 北京 清华大学机械工程系 北京  
焦玮 清华大学先进成形制造技术教育部重点实验室 北京 清华大学机械工程系 北京  
李滔 清华大学先进成形制造技术教育部重点实验室 北京 清华大学机械工程系 北京  
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