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为了研究脉冲电流对2A97铝锂合金动态拉伸变形行为的影响，在300～500℃的温度范围内进行了电脉冲辅助单轴拉伸实验和无电流辅助的单轴拉伸实验。结果表明，脉冲电流不会降低2A97铝锂合金的极限工程应力，但当应变量增至横截面缩小30%时，脉冲电流可诱导流动应力的降低，且该作用随温度的升高逐渐减小：300℃时，脉冲电流诱导流动应力降低18%;400℃时，脉冲电流引起流动应力降低的幅度减小为14%;500℃时，脉冲电流仅引起流动应力降低近5%。微观组织分析表明，脉冲电流通过促进2A97铝锂合金的动态回复和动态再结晶来诱导流动应力降低。进一步的分析表明，脉冲电流的局部热点效应可为位错核心提供较高的能量，降低位错运动的阻力，从而促进2A97铝锂合金的动态回复及动态再结晶。
Abstract：To investigate the influence of electropulse on the dynamic tensile deformation behavior of 2A97 Al-Li alloy, uniaxial tensile tests with and without electropulse assisted were conducted at 300-500 ℃. The results show that electropulse does not reduce the ultimate engineering stress of 2A97 Al-Li alloy. However, when the strain increases to cross-sectional reduction of 30%, the electropulse can induce reduction of flow stress, and the effect diminishes with the increase of temperature. At 300 ℃, the flow stress induced by electropulse is reduced by 18%; at 400 ℃, the reducing amplitude of flow stress induced by electropulse is reduced to 14%; at 500 ℃, electropulse only causes the reduction of flow stress of approximately 5%. Microstructural analysis shows that electropulse induces the reduction of flow stress by promoting dynamic recovery and dynamic recrystallization of 2A97 Al-Li alloy. Further analysis indicates that the local hot spot effect of electropulse can provide higher energy to dislocation cores, reduce the resistance of dislocation motion, and thereby promote dynamic recovery and dynamic recrystallization of 2A97 Al-Li alloy.
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基本信息:
DOI：
中图分类号:TG146.21
引用信息:
[1]李明浩,陈国清,祖宇飞等.脉冲电流辅助成形2A97铝锂合金动态拉伸行为及组织演变[J].塑性工程学报,2025,32(08):55-68.
基金信息:
国家自然科学基金资助项目(U1908229;52075073)