Deformation Behavior and Constitutive Model of AZ31 Magnesium Alloy under Pulsed Current-Ultrasonic Coupled Field

YUAN Chenxi; SONG Zimo; LIU Chengxin; LIN Shuxia; CHU Xingrong

doi:10.3969/j.issn.1674-6457.2026.05.001

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (5) : 1-11. DOI: 10.3969/j.issn.1674-6457.2026.05.001

Light Alloy Forming

Deformation Behavior and Constitutive Model of AZ31 Magnesium Alloy under Pulsed Current-Ultrasonic Coupled Field

YUAN Chenxi¹, SONG Zimo², LIU Chengxin¹, LIN Shuxia¹, CHU Xingrong^1,*

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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.

Key words

AZ31B magnesium alloy / pulsed current-ultrasonic vibration / constitutive model / coupling effect / deformation resistance

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YUAN Chenxi, SONG Zimo, LIU Chengxin, LIN Shuxia, CHU Xingrong. Deformation Behavior and Constitutive Model of AZ31 Magnesium Alloy under Pulsed Current-Ultrasonic Coupled Field[J]. Journal of Netshape Forming Engineering. 2026, 18(5): 1-11 https://doi.org/10.3969/j.issn.1674-6457.2026.05.001

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