王梦寒,孟 烈,危 康,岳宗敏,汪丰林.Cu-Ag合金高温流变特性及其改进的本构模型[J].稀有金属材料与工程,2017,46(12):3733~3738.[Wang Menghan,Meng Lie,Wei Kang,Yue Zonmin,Wang Fenglin.High temperature deformation properties and the modification of constitutive model of Cu-Ag alloy[J].Rare Metal Materials and Engineering,2017,46(12):3733~3738.]
Cu-Ag合金高温流变特性及其改进的本构模型
投稿时间:2015-10-01  修订日期:2016-01-07
中文关键词:  Cu-6 wt.% Ag合金  高温塑性变形  微观组织  孪生  本构模型
基金项目:中央高校基本科研业务费资助项目(CDJZR14130006)
中文摘要:
      在变形温度为973~1123K和应变速率0.01~10s-1条件下对Cu-6 wt.% Ag合金进行等温热压缩实验。利用实验所得流变应力—应变曲线,分析了高应变速率下Cu-6 wt.% Ag合金高温塑性变形时微观组织的演变行为;研究了高温塑性变形中材料的塑性变形机制;构建了一种简化的本构模型,并引入Arrhenius方程及Z参数对模型进行改进。研究结果表明:Cu-6 wt.% Ag合金在热塑性变形过程中发生了明显的动态回复和动态再结晶,在应变速率为0.1s-1、1s-1温度为1123K变形条件下发生孪生行为,造成流变应力突变而升高,出现应力谷值;经改进后的本构模型,集成了变形温度、变形速率及应变对流变特性的影响,预测精度高,更利于通过计算机语言写入有限元软件分析计算。
High temperature deformation properties and the modification of constitutive model of Cu-Ag alloy
英文关键词:Cu-6 wt.% Ag alloy  hot deformation  microstructure  twinning  constitutive model
英文摘要:
      The hot deformation behavior of Cu-6 wt.% Ag alloy was described by hot compression tests in the temperature range of 973~1123K and stain rates of 0.01~10s-1. The microstructure evolution of the alloy was investigated in this paper. The true stress-strain curves were studied to reveal the hot deformation mechanism of Cu-6 wt.% Ag alloy. A simple constitutive model was established. The Arrhenius equation and Z were quoted in this investigation to modified the model. The results show that the dynamic recovery, dynamic recrystallization occurred in Cu-6 wt.% Ag alloy during hot deformation. And twinning behavior was observed at the strain rates of 0.1s-1 and 1s-1 temperature of 1123K. This twining behavior result in sharp changing of flow stress. With the increase of flow stress, a valley of stress was observed directly. The modified model which integrated the influence of temperature, strain rates, strain on flow characteristic could predict the stress accurately and be compiled easily.
作者单位E-mail
王梦寒 重庆大学 cquwmh@163.com 
孟 烈 重庆大学  
危 康 重庆大学  
岳宗敏 重庆大学  
汪丰林 Institute for Materials Research,Tohoku University,Sendai -,Japan  
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