Transactions of Materials and Heat Treatment

Title：Deformation behavior and constitutive modeling for TA1 pure titanium under ultrasonic vibration assisted compression

Authors： Zhang Haidong Deng Lei Tang Xuefeng Zhang Mao Wang Xinyun Jin Junsong

Unit： Huazhong University of Science and Technology

KeyWords： TA1 pure titanium ultrasonic vibration ultrasonic softening residual softening rheology behavior microstructure

ClassificationCode：TG316

year,vol(issue):pagenumber：2024,49(3):107-113

Abstract：

The influences of ultrasonic vibration on the rheology behavior and microstructure evolution of TA1 pure titanium were investigated by the ultrasonic vibration assisted compression tests, and the corresponding mechanism of acoustoplasticity was discussed. Then, the constitutive model was constructed based on genetic algorithm-artificial neural network (GA-ANN). The results show that there are obvious ultrasonic softening and residual softening phenomena in TA1 pure titanium. The residual softening effect of ultrasonic vibration can be divided into the unsteady part which decays with strain and the steady part which can be maintained for a long time, and the proportion of unsteady residual softening increases with the increasing of ultrasonic amplitude. The rapid saturation and decline of twins under ultrasonic vibration action lead to steady residual softening effect, while the rapid entanglement of uniformly distributed dislocations after stopping ultrasonic vibration leads to the attenuation of unsteady residual softening effect. GA-ANN model shows high precision and generalization ability, and can accurately describe the ultrasonic softening and residual softening effects that vary with strain and ultrasonic amplitude.

Funds：

国家自然科学基金资助项目（52090043）

作者简介：张海栋（1997-），男，博士研究生，E-mail：zhanghd@hust.edu.cn；通信作者：邓磊（1982-），男，工学博士，教授，E-mail：denglei@hust.edu.cn

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