Electrically Assisted Short-term Stress Relaxation Behavior of Ti-6Al-4V Titanium Alloy Foil

JIANG Wei; TANG Zejun; LI Xinjie; AI Yucong

doi:10.3969/j.issn.1674-6457.2026.01.004

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (1) : 36-45. DOI: 10.3969/j.issn.1674-6457.2026.01.004

Light Alloy Forming

Electrically Assisted Short-term Stress Relaxation Behavior of Ti-6Al-4V Titanium Alloy Foil

JIANG Wei, TANG Zejun^*, LI Xinjie, AI Yucong

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Abstract

The work aims to study the electrically assisted short-term stress relaxation behavior of Ti-6Al-4V titanium alloy foil and construct the electrically assisted stress relaxation constitutive equation and creep constitutive model. The electrically assisted stress relaxation test platform was built, and the short-term stress relaxation experiments of Ti-6Al-4V foil with peak currents of 14 A, 18 A and 22 A were carried out under the deformation conditions of pre-displacement of 0.6 mm. The temperature and distribution characteristics under different pulse current parameters were obtained. The effective pre-strain was introduced to consider the effect of thermal expansion on foil, and the stress-time curves under different initial conditions were drawn. The cubic delay function was used to fit the electrically assisted stress relaxation curve of Ti-6Al-4V foil. Based on the Arrhenius constitutive equation, a hyperbolic sine-type electrically assisted creep constitutive model was established and its prediction accuracy was verified. According to the non-uniform temperature field distribution on foil, the actual effective pre-strain could be calculated. When the peak current was higher, the residual stress at the end of relaxation was lower, and the stress relaxation ratio was higher. The prediction accuracy of the electrically assisted stress relaxation constitutive equation was above 99.805%, and the prediction accuracy of the electrically assisted creep constitutive model was above 90.441%. The electrically assisted stress relaxation behavior (initial stress, residual stress at the end of relaxation, stress relaxation ratio, creep strain rate, etc.) of Ti-6Al-4V foil is affected by pre-strain and pulse current, and the pulse current is dominant. The stress relaxation equation and creep constitutive model established by considering effective pre-strain and peak current have high prediction accuracy.

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Ti-6Al-4V titanium alloy / electrically assisted / short-term stress relaxation / foil / constitutive model

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JIANG Wei, TANG Zejun, LI Xinjie, AI Yucong. Electrically Assisted Short-term Stress Relaxation Behavior of Ti-6Al-4V Titanium Alloy Foil[J]. Journal of Netshape Forming Engineering. 2026, 18(1): 36-45 https://doi.org/10.3969/j.issn.1674-6457.2026.01.004

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