摘要
研究了常温至1073K、不同应变率下（4．1×10^-4s^-1～2．8×10^3s^-1）锆的压缩力学性能。结果表明，锆的流动应力对温度和应变率的变化比较敏感，随应变率的提高而增大，随温度的升高而降低。基于位错动力学理论，建立了锆的本构模型，并考虑塑性变形过程中孪晶演化的影响，对模型进行了修正。修正后的本构模型预测结果与实验结果吻合较好，可描述很宽应变率和温度范围内锆的塑性变形行为。
The thermo-mechanical response of zirconium has been investigated under temperature ranging from normal temperature to 1 073 K and strain rate from 4.1×10^-4s^-1to2.8×10^3s^-1 Results show that the flow stress and strain hardening rate of zirconium are very sensitive to the changes of temperature and strain rate. The flow stress and strain hardening rate increase with the increase of strain rate, and decrease with the increase of temperature. Based on the concept of dislocation kinemat- ics,a physically based constitutive model is developed,and the model is modified by taking into account of the effect of developing twins during deformation. The modified model could be used to predict the flow stress of zirconium over a wide range of temperature and strain rates. The experimental results are in good agreement with the predictions.
出处
《高压物理学报》
EI
CAS
CSCD
北大核心
2009年第1期46-50,共5页
Chinese Journal of High Pressure Physics
关键词
锆
流动应力
高温
高应变率
本构模型
zirconium plastic flow stress
high temperature
high strain rate
constitutive model
