NDLI: Plasticity and microstructure evolution of W-CeO$_{2}$ rods with different short-duration pulse currents

Content Provider	Springer Nature Link
Author	Zhu, Wen Guang Yang, Jian Can Cao, Jie Huang, Lin Xi, Yu Chen Nie, Zuo Ren
Copyright Year	2015
Abstract	To improve the formability of W-rare earth electrode, the influence of high-energy pulse on the plasticity property of W-CeO$_{2}$ rods was investigated. The effects of current density (J $_{0}$), pulse width (t $_{w}$), frequency (f), and strain rate on the plasticity of W-CeO$_{2}$ rods were discussed in detail. Results of tensile tests show that the W-CeO$_{2}$ rods applied with the electrical pulses obtain a maximum percentage total elongation at fracture (9.65 %), increased by 118.7 % 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.
Starting Page	981
Ending Page	986
Page Count	6
File Format	PDF
ISSN	10010521
Journal	Rare Metals
Volume Number	36
Issue Number	12
e-ISSN	18677185
Language	English
Publisher	Nonferrous Metals Society of China
Publisher Date	2015-10-31
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pulse current Plasticity W-CeO$_{2}$ rod Low-angle grain boundary Metallic Materials Nanotechnology Ceramics, Glass, Composites, Natural Materials Surfaces and Interfaces, Thin Films Inorganic Chemistry Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Physical and Theoretical Chemistry Condensed Matter Physics

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