Plasticity and microstructure evolution of W-CeO2 rods with different short-duration pulse currents

作     者：Wen-Guang Zhu Jian-Can Yang Jie Cao Lin Huang Yu-Chen Xi Zuo-Ren Nie 

作者机构：School of Materials Science and Engineering Beijing University of Technology Beijing 100124 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2017年第36卷第12期

页      面：981-986页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financially supported by the National Key Technology R&D Program of China (No. 2012BAE06 B02) the Beijing Municipal Science and Technology Project (No. Z141100003814008) 

主　　题：Pulse current Plasticity W-CeO_2 rod Lowangle grain boundary 

摘      要：To improve the formability of W-rare earth electrode, the influence of high-energy pulse on the plasticity property of W-CeOrods was investigated. The effects of current density(J), pulse width(tw), frequency(f), and strain rate on the plasticity of W-CeOrods were discussed in detail. Results of tensile tests show that the W-CeOrods applied with the electrical pulses obtain a maximum percentage total elongation at fracture(9.65 %), increased by118.7 % compared to that without pulses. This is owing to both the heat effect and the interaction of current between dislocations and rare earth additions. Electron back scattered diffraction(EBSD)-generated grain boundary(GB) maps suggest that the length of low-angle grain boundaries composed of high-density dislocations decreases after deformation while applying the pulse current. This demonstrates that the short-duration pulsed current enhances the mobility of dislocations. Scanning electron microscopy(SEM) images of the rods after deformation with the pulse current show that the long fiber-shaped additions become discontinuous,which could reduce the stress concentration and hinder the crack propagation.