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

作　　者：Cheng-Cai Wang Qing-Jie Li Liang Chen Yong-Hong Cheng Jun Sun ZhioWei Shan Ju Li Evan Ma 

机构地区：[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

出　　处：《Nano Research》2015年第7期2143-2151,共9页纳米研究（英文版）

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.

关 键 词：electrical discharge  welding  nanoscale  METALLIC glass  metal 

分 类 号：O[理学]