The room-temperature compression tests of Ti6Al4V alloy are conducted under different ultrasonic vibration conditions. The effects of ultrasonic energy field and strain rate on the plastic deformation behaviors and microstructure evolution are carefully investigated. Moreover, by considering the effects of ultrasonic energy field, a modified Johnson-Cook (MJC) constitutive model and a deep-improved Johnson-Cook (DJC) constitutive model are constructed to represent the plastic deformation behaviors of Ti6Al4V alloy. The results indicate that the plastic deformation behaviors of Ti6Al4V alloy are remarkably affected by the ultrasonic energy field and strain rate. As the vibration amplitude rises or the strain rate decreases, the flow stress exerts a decrease trend. The introduction of ultrasonic energy field boosts the activation of {0001}<112¯0> basal slip systems and the formation of soft orientation <0001>, which facilitates dislocation multiplication and uniform distribution of dislocations. Meanwhile, dislocation motion is enhanced, and dislocation cells are smoothly rearranged into subgrain boundaries, which further promotes the grain refinement. In addition, the progress of grain rotation is accelerated toward the soft orientation <0001>, which boosts the formation of <0001>//ND texture. By comparing the measured and predicted stress, both the MJC model and the DJC model show the good agreement to reproduce the plastic deformation behavior under different ultrasonic vibration conditions. However, the higher correlation coefficient (equals to 0.999) and the lower average absolute relative error (controlled in 4.27 %) indicate that the DJC model enjoys the superior prediction capability compared to the MJC model.

中文翻译：

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超声能量场对Ti6Al4V合金室温压缩塑性变形行为及组织演化的影响


在不同的超声振动条件下对Ti6Al4V合金进行了室温压缩试验。仔细研究了超声能量场和应变率对塑性变形行为和微观结构演变的影响。此外，考虑超声能量场的影响，构建了修正的Johnson-Cook（MJC）本构模型和深度改进的Johnson-Cook（DJC）本构模型来表征Ti6Al4V合金的塑性变形行为。结果表明，超声能量场和应变速率对Ti6Al4V合金的塑性变形行为影响显着。随着振幅的增大或应变速率的减小，流变应力呈现减小的趋势。超声能量场的引入促进了{0001}<112´0>基底滑移系的激活和软取向<0001>的形成，有利于位错的倍增和位错的均匀分布。同时，位错运动增强，位错单元顺利重排至亚晶界，进一步促进晶粒细化。此外，晶粒旋转的进程加速朝向软取向<0001>，这促进了<0001>//ND织构的形成。通过比较测量的应力和预测的应力，MJC 模型和 DJC 模型在不同超声振动条件下再现塑性变形行为表现出良好的一致性。但较高的相关系数（等于0.999）和较低的平均绝对相对误差（控制在4.27%）表明DJC模型相对于MJC模型具有更优越的预测能力。