Laves相NbCr_(2)/Nb两相合金的应变补偿物理本构关系研究  

Strain-Compensated Physical Constitutive Relation of Laves Phase NbCr_(2)/Nb Dual-phase Alloy

作　　者：张开铭 鲁世强[1] 江丰建聪 王克鲁[1] 邓莉萍 Zhang Kaiming;Lu Shiqiang;Jiangfeng Jiancong;Wang Kelu;Deng Liping(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《稀有金属材料与工程》2023年第8期2835-2843,共9页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51964034);江西省教育厅科技项目(DA202101164)。

摘　　要：Laves相NbCr_(2)/Nb两相合金因其优良的高温力学性能而具有作为新型高温结构材料应用的潜力;流动应力本构关系反映了合金的热变形行为。本研究基于Laves相NbCr_(2)/Nb两相合金在1000~1200℃、0.001~0.1 s^(-1)条件下的等温恒应变速率压缩实验数据,首次探讨了该合金在考虑变形温度对合金杨氏模量和自扩散系数影响的应变补偿物理本构关系。结果表明,基于蠕变指数n=5的应变补偿物理本构关系的相关系数R和平均绝对相对误差AARE分别为0.974和59.3%,说明该物理本构模型不适于表征该合金的流动应力行为;而基于蠕变指数n为变量的应变补偿物理本构关系的相关系数R和平均绝对相对误差AARE分别为0.984和10.6%,说明该物理本构模型能满意地表征该合金的流动应力行为,且其对流动应力的预测能力优于传统的Arrhenius本构模型。The Laves phase NbCr_(2)/Nb dual-phase alloy has the potential of a new high-temperature structural material due to its excellent high-temperature mechanical properties.It is known that the flow stress constitutive relationship reveals the hot deformation behavior of an alloy.In this research,the strain-compensated physical constitutive relationship of Laves phase NbCr_(2)/Nb dual-phase alloy with consideration of the effect of deformation temperature on the Young’s modulus and self-diffusion coefficient of the alloy was explored for the first time based on its isothermal constant strain rate compression experiment data at temperature of 1000-1200°C and strain rate of 0.001-0.1 s^(-1).The results show that the correlation coefficient(R)and the average absolute relative error(AARE)of the strain-compensated physical constitutive relationship based on the creep index n=5 are 0.974 and 59.3%,respectively,indicating that this physical constitutive model is not accurate in characterizing the flow stress behavior of the alloy.Whereas the R and the AARE of the strain-compensated physical constitutive relationship based on the variable of creep index n are 0.984 and 10.6%,respectively,showing that this physical constitutive model can satisfactorily characterize the flow stress behavior of the alloy and the flow stress prediction accuracy of the physical constitutive model is higher than the traditional Arrhenius constitutive model.

关 键 词：Laves相NbCr_(2)/Nb两相合金 应变补偿物理本构模型 蠕变指数 自扩散系数 杨氏模量 

分 类 号：TG146.416[一般工业技术—材料科学与工程]