Transactions of Materials and Heat Treatment

Title：Superplastic deformation behavior and constitutive model on Ti60 titanium alloy

Authors： Liao Ziying1 Li Baoyong1 Liu Wei1 Qin Zhonghuan1 Wu Dipeng2 Wu Yong2

Unit： 1. Beijing Hangxing Machine Manufacturing Co. Ltd. 2. College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and Astronautics

KeyWords： Ti60 titanium alloy high temperature titanium alloy superplasticity constitutive model Arrhenius equation

ClassificationCode：TG131

year,vol(issue):pagenumber：2024,49(8):249-254

Abstract：

To determine the superplastic deformation behavior of Ti60 titanium alloy and promote its engineering application, superplastic tensile tests were conducted on Ti60 titanium alloy at the deformation temperatures of 880-960 ℃ and the strain rates of 0.0001-0.01 s-1. The results show that the elongation of Ti60 titanium alloy reaches its maximum value in the condition of 960 ℃ and 0.001 s-1, which is 365%. At lower strain rates (0.001 and 0.0001 s-1), the material exhibits significant strain hardening, while at lower deformation temperature(880 ℃) and higher strain rate (0.01 s-1), the material exhibits stress softening. When the deformation temperature is constant, the peak stress decreases with the decreasing of strain rate. Based on the Arrhenius equation, a constitutive model is constructed, and a method for directly solving the Arrhenius equation without distinguishing the flow stress level is proposed. The strain change is introduced to modify the Arrhenius equation. The correlation coefficient R between the theoretical calculation value of the modified Arrhenius equation and the test value is 0.9914, with an average relative error of 6.62%. The error between the calculated and test results is within an acceptable range, which provides the data support for the use of Ti60 titanium alloy in complex component superplastic forming.

Funds：

国家重点研发计划资助项目（2023YFB3407000）；国防基础科研计划（JCKY2021204A004）

作者简介：廖子颖(1998-)，男，硕士研究生 E-mail：1821946291@qq.com 通信作者：李保永（1984-），男，博士，正高级工程师 E-mail：libaoyonght239@163.com

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