锻压技术

难变形金属电-热-力耦合作用下的电致塑性效应研究现状

英文标题：Current status of research on electroplasticity effect for difficult-to-deform metals under electro-thermo-mechanical coupling

作者：夏琴香陈灿肖刚锋谢章雄

单位：华南理工大学机械与汽车工程学院

关键词：难变形金属电致塑性效应实验表征方法宏观塑性变形行为微观组织演变

分类号：TG115.5；TH142

出版年,卷(期):页码：2021,46(9):124-131

摘要：

通过分析难变形金属材料的变形特点，提出利用电致塑性效应来实现其精确塑性成形；从电-热-力耦合作用下的电致塑性效应实验表征方法、宏观塑性变形行为、微观组织演变机理等方面总结了难变形金属电致塑性效应的研究现状。分析了采用电流辅助拉伸/恒温拉伸实验、有/无强制性冷却电流辅助拉伸实验来解耦电致塑性效应的实验表征方法及其不足；探讨了电-热-力耦合作用下电流参数、电流施加方式等变形条件对难变形金属宏观塑性变形行为的影响规律；综述了在电流诱导下加快位错滑移、促进动态再结晶及形成局部焦耳热效应的微观组织演变的物理机制。在此基础上，提出了电-热多能场作用下实现难变形金属精确塑性成形所需解决的问题及发展方向。

By analyzing deformation characteristics of difficult-to-deform metal materials, the electroplasticity effect was proposed to realize the precise plastic forming of difficult-to-deform metals, and the current status of research on electroplasticity effect for difficult-to-deform metals was reviewed from the aspects of experimental characterization methods of electroplasticity effect, macroscopic plastic deformation behavior and microstructure evolution mechanism under the electro-thermo-mechanical coupling. Then, the experimental characterization methods for decoupling the electroplasticity effect by the current-assisted tensile/thermal tensile experiment and current-assisted tensile experiment with/without the forced cooling and their shortcomings were analyzed, and the influence laws of deformation conditions, such as current parameters and current application modes, on the macroscopic plastic deformation behavior of difficult-to-deform metals were discussed. Furthermore, the physical mechanism of the microstructure evolution that accelerated dislocation slip, promoted dynamic recrystallization and produced local Joule heat effect under the current induction was reviewed, and on this basis, the problems and development directions that need to be solved to achieve precise plastic forming of difficult-to-deform metals under the action of electro-thermo-mechanical multi-energy fields were proposed.

基金项目：

国家自然科学基金资助项目（51775194）; 广州市科技计划项目（201804010135）

夏琴香（1964-），女，博士，教授 E-mail：meqxxia@scut.edu.cn 通信作者：陈灿（1994-），男，博士研究生 E-mail：mecan.chen@mail.scut.edu.cn

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