Ti-22Al-25Nb合金板材高温拉伸变形行为的本构模型  

Constitutive Models for Tensile Deformation Behavior of Ti-22Al-25Nb Alloy Sheet at Elevated Temperatures

作　　者：鲁羽鹏 孟令健 殷宏亮 林鹏[1,2] Lu Yupeng;Meng Lingjian;Yin Hongliang;Lin Peng(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;National Key Laboratory of Science and Technology on Precision Heat Processing of Metals,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]哈尔滨工业大学、金属精密热加工国家级重点实验室,黑龙江哈尔滨150001

出　　处：《稀有金属材料与工程》2023年第3期785-790,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51505323);Applied Basic Research Program of Shanxi Province(20210302123117,20210302124658)。

摘　　要：在1203~1283 K的温度范围内,以20 K的温度间隔对O相Ti-22Al-25Nb合金进行了等温单向拉伸试验,应变速率为2.5×10^(−4)、5.0×10^(−4)、1×10^(−3)、2×10^(−3)、4×10^(−3)、1×10^(−2)和5×10^(−2)s^(-1),并对不同变形温度下的试样组织进行了表征。通过实验结果,确定了本构模型的材料常数;α2+B2/β+O三相区(1203~1243 K)和α2+B2两相区(1243~1283 K)的拉伸变形激活能分别为845165和412779 J/mol。构建了Arrhenius本构模型来描述Ti-22Al-25Nb合金在不同温度下的拉伸变形行为。Isothermal uniaxial tension tests for O phase-based Ti-22Al-25Nb alloys were conducted at 1203-1283 K with temperature interval of 20 K.The strain rates were 2.5×10^(-4),5.0×10^(-4),1×10^(-3),2×10^(-3),4×10^(-3),1×10^(-2),and 5×10^(-2)s-1.The microstructures of specimens at different deformation temperatures were characterized.Through the experiment results,the material constants for the constitutive models are determined and the tensile deformation activation energies are 845165 and 412779 J/mol atα2+B2/β+O threephase region(1203-1243 K)andα2+B2 two-phase region(1243-1283 K),respectively.Arrhenius-type constitutive models are constructed to characterize the tensile deformation behavior of Ti-22Al-25Nb alloy at different temperatures.

关 键 词：TI2ALNB 本构模型 微观组织 变形行为 

分 类 号：TG146.23[一般工业技术—材料科学与工程]