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Ultrafast shape change and joining of small-volume materials using nanoscale electrical discharge

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分类：O[理学]
作者机构：[1]Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) & Hysitron Applied Research Center in China (HARCC), State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China, [2]State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China, [3]Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA, [4]Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA, [5]SJS Limited, 101 Xihuan Road, Jingzhou, Hubei 434024, China
相关基金：This work was supported by the grants from NSFC （Nos. 50925104, 51231005 and 51321003） and 973 （Program of China）（Nos. 2010CB631003, 2012CB619402） We also appreciate the support from the 111 Project of China （No. B06025）. Both E. M. and J. L. carried out this work under an adjunct professorship at XJTU. J. L. acknowledges support by NSF （No. DMR- 1120901）. E. M. was supported at JHU by US-NSF （No. DMR-0904188）.

作者： Cheng-Cai Wang[1,5], Qing-Jie Li[1,4], Liang Chen[1,2], Yong-Hong Cheng[2], Jun Sun[1], ZhioWei Shan[1], Ju Li[1,3], Evan Ma[1,4]

关键词： electrical, discharge, , welding, , nanoscale, , METALLIC, glass, , metal

中文摘要：

Using nanoscale electrical-discharge-induced rapid Joule heating, we developed a method for ultrafast shape change and joining of small-volume materials. Shape change is dominated by surface-tension-driven convection in the transient liquid melt, giving an extremely high strain rate of N106 s-1. In addition, the heat can be dissipated in small volumes within a few microseconds through thermal conduction, quenching the melt back to the solid state with cooling rates up to 108 K.s-1. We demonstrate that this approach can be utilized for the ultrafast welding of small-volume crystalline Mo （a refractory metal） and amorphous Cu49Zr51 without introducing obvious microstructural changes, distinguishing the process from bulk welding.

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