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为研究在脉冲电流处理时温度对Ti-6Al-4V合金电效应的影响,在400～800℃温度范围内对比分析了脉冲电流处理和等温热处理后Ti-6Al-4V合金的显微组织和力学性能。结果表明,当温度低于600℃时,脉冲电流对Ti-6Al-4V合金的显微组织几乎无影响;当温度高于700℃时,脉冲电流使Ti-6Al-4V合金发生了α→β相变,脉冲电流促进了新β相的形核和β相晶粒的长大。拉伸试验发现,温度高于600℃时, PECT试样的极限应力低于IT试样的极限应力;在温度为700℃时,相比等温热处理,脉冲电流处理后材料的最大真实应力降低约10%,平均断裂伸长率提高21%。焦耳热效应带来的温度升高是激活电效应的必要条件,温度与脉冲电流在调控Ti-6Al-4V合金微观组织与力学性能方面可能存在协同作用机制,对Ti-6Al-4V合金来说,只有温度高于700℃时,电效应才显著生效进而影响材料的显微组织和力学性能。
Abstract：To investigate the impact of pulsed electric current treatment(PECT) on the electrothermal effect of Ti-6Al-4V alloy, the microstructure and mechanical properties of Ti-6Al-4V alloy were systematically analyzed in the temperature range of 400-800 ℃. The results indicate that pulsed electric current has little effect on the microstructure and mechanical properties of Ti-6Al-4V alloy when the temperature is below 600 ℃. When the temperature exceeds 600 ℃, the pulsed electric current induces an α→β phase transformation in Ti-6Al-4V alloy, and promotes the formation and growth of new β-phase nuclei and β-phase grains. Tensile test results show that the ultimate tensile strength of PECT specimens is lower than that of isothermal treatment(IT) specimens when the temperature is above 600 ℃, while the ultimate tensile strength of PECT specimens is higher than that of IT specimens when the temperature reaches 700 ℃. Specifically, the maximum true stress of the material after pulsed electric current treatment is reduced by approximately 10%, and the average fracture elongation is increased by 21%. The temperature rise induced by the Joule effect is a necessary condition for the electrothermal effect. There may exist a synergistic mechanism between the temperature effect and pulsed electric current in regulating the microstructure and mechanical properties of Ti-6Al-4V alloy.For Ti-6Al-4V alloy, the electrical effect becomes significant and affects the microstructure and mechanical properties of the material only when the temperature is above 700 ℃.
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基本信息:
中图分类号:TG146.23
引用信息:
[1]邓锋,徐雪峰,肖洁,等.脉冲电流处理影响Ti-6Al-4V合金宏微观行为的温度依赖性[J].塑性工程学报,2026,33(04):154-165.
基金信息:
国家自然科学基金资助项目(52265052)
2026-04-22
2026-04-22
2026-04-22