Al-Cu-Li合金热变形特性与位错密度模型构建
Thermal Deformation Characteristics and Dislocation Density Model Construction of Al-Cu-Li Alloy
江余鹏 1夏润泽 1杜瑞博 1龚莉铭 1王佳林1
作者信息
- 1. 重庆科技大学冶金与材料工程学院,重庆 401331
- 折叠
摘要
通过等温压缩试验,研究热轧态Al-Cu-Li合金在温度为390～480℃、应变速率为0.01～1 s-1下的流变行为.基于热压缩流动应力数据构建了峰值应力Arrhenius本构模型,其平均相对误差绝对值(AARE)为4.612%.基于该模型数据,采用K-M模型以及Taylor关系式建立了耦合温度、应变速率、峰值应力、峰值应变的位错密度模型.该模型AARE值为5.926%,具有较高精度,为准确描述Al-Cu-Li合金在热变形过程中的位错密度演变提供参考.
Abstract
The isothermal compression experiments of hot rolled Al-Cu-Li alloy at temperature range of 390～480℃and strain rate range of 0.01～1 s-1 were carried out on GLEEBLE-3500 isothermal simulator.The peak stress Arrhenius constitutive model was con-structed based on the isothermal compression flow stress data,and its average absolute relative error(AARE)is 4.612%.Based on the model,a dislocation density model of coupling temperature,strain rate,peak stress and peak strain was constructed based on K-M model and Taylor relationship,which has an AARE-value of 5.926%,indicating a high prediction precision.This model provides a reference for accurately describing the dislocation density evolution of Al-Cu-Li alloy during thermal deformation.
关键词
Al-Cu-Li合金/热变形/本构模型/位错密度模型Key words
Al-Cu-Li alloy/thermal deformation/constitutive model/dislocation density model引用本文复制引用
基金项目
重庆科技学院研究生创新计划(YKJCX2220221)
出版年
2024
NETL
NSTL
万方数据