锻压技术

TA1纯钛超声振动辅助压缩变形行为及本构建模

英文标题：Deformation behavior and constitutive modeling for TA1 pure titanium under ultrasonic vibration assisted compression

作者：张海栋邓磊唐学峰张茂王新云金俊松

单位：华中科技大学

关键词：TA1纯钛超声振动超声软化残余软化流变行为微观组织

分类号：TG316

出版年,卷(期):页码：2024,49(3):107-113

摘要：

通过TA1纯钛的超声振动辅助压缩实验，探究了超声振动对材料流变行为以及微观组织演化的影响，分析了相应的声塑性作用机理，并基于遗传算法-人工神经网络(GA-ANN)建立了本构模型。结果表明：TA1纯钛中出现了明显的超声软化和残余软化现象。超声振动的残余软化效应可分为随应变衰减的非稳态部分和可长期保持的稳态部分，并且非稳态残余软化的占比随着超声振幅的增加而增加。超声振动作用下孪晶的快速饱和及下降导致了稳态的残余软化效应，而超声振动停止后均匀分布的位错的快速缠结则导致了非稳态残余软化效应的衰减。GA-ANN模型表现出较高的精度以及泛化能力，可准确描述随应变和超声振幅变化的超声软化和残余软化效应。

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.

基金项目：

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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