目的 电脉冲-超声复合能量场辅助的AZ31B板材进行单轴拉伸试验,并基于热激活以及位错密度演化理论,构建了一种混合本构模型,用以描述复合能场辅助下镁合金的塑性变形行为。方法 引入无量纲修正参数表征超声振动和脉冲电流对位错存储与恢复的影响,采用粒子群算法进行参数拟合,并通过多项式回归建立修正参数与振幅、电流密度的关系,利用平均绝对百分比误差验证模型预测能力。结果 电脉冲-超声的耦合作用可协同降低AZ31镁合金的变形抗力,耦合作用引起的软化效应在电流密度40 A/mm2、超声振幅5.8 μm时达到最大,超过此电流密度,协同软化效果显著减弱,且超声振动的贡献下降。结论 脉冲电流-超声耦合场作用会引起残余硬化效应,且在不同电流密度下有明显变化;此外,本研究提出的混合本构模型在预测AZ31镁合金流动应力方面较为准确。
Abstract
The work aims to carry out uniaxial tensile tests on AZ31B magnesium alloy sheets under a coupled electric pulse and ultrasonic energy field and establish a hybrid constitutive model based on the theories of thermal activation and dislocation density evolution, to characterize the plastic deformation behavior of the magnesium alloy subjected to the coupled field. A dimensionless correction parameter was introduced to characterize the effect of ultrasonic vibration and pulsed current on dislocation storage and recovery. Parameter fitting was performed with a particle swarm optimization algorithm, and a polynomial regression model was developed to relate the correction parameter to amplitude and current density. The predictive capability of the proposed model was validated by the mean absolute percentage error. The coupled effect of electric pulses and ultrasound acted synergistically to reduce the deformation resistance of AZ31 magnesium alloy. The softening effect induced by this coupling reached its maximum at a current density of 40 A/mm2 and an ultrasonic amplitude of 5.8 μm. Beyond this current density, the synergistic softening effect diminished markedly, and the contribution of ultrasonic vibration decreased. The interaction between the pulsed current and the ultrasonic coupled field generates a residual hardening effect, the magnitude of which varies considerably with current density. Moreover, the hybrid constitutive model proposed in this work offers reasonably accurate predictions of the yield stress of AZ31 magnesium alloy.
关键词
AZ31B镁合金 /
脉冲电流-超声振动 /
本构模型 /
耦合效应 /
变形抗力
Key words
AZ31B magnesium alloy /
pulsed current-ultrasonic vibration /
constitutive model /
coupling effect /
deformation resistance
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基金
国家自然科学基金（52175339）; 国家自然科学基金（52575411）
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