1. Significant mechanical softening of copper under coupled electric and magnetic stimuli.
- Author
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Yang, Yueqing, Wang, Yuecun, Lu, Huanhuan, Wang, Zhangjie, Xie, Degang, Zhao, Yongfeng, Du, Junli, Wang, Chaohua, Ma, En, and Shan, Zhiwei
- Subjects
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TRANSMISSION electron microscopes , *METAL fractures , *STIMULUS & response (Psychology) , *COPPER , *MAGNETIC fields - Abstract
The mechanical reliability of metallic components is vital for the stable operation of electrical equipment, especially for those used in ultra-high voltage transmission and electromagnetic launching, where metallic materials inevitably suffer from high-density current and strong magnetic field. However, little has been known about the mechanical behavior of metals under the electric-magnetic coupling stimuli. Here, by performing quantitative electromechanical tests under the built-in magnetic field inside transmission electron microscope, we found that copper, one of most commonly used conductive metals, can be significantly softened by the coupled electrical-magnetic stimuli, manifested as notable yield strength drop by five-times and obvious creep deformation at room temperature. A plausible mechanism behind the unusual softening, local-Lorentz-force-assisted dislocations depinning, has been proposed. Our results shed new light on understanding the deformation-induced failure of metals served in electromagnetic environments, and also inspire a new mechanical processing way for reshaping metals at much lower loads and temperatures. [Display omitted] [ABSTRACT FROM AUTHOR]
- Published
- 2023
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