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

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Abstract

To improve the formability of W-rare earth electrode, the influence of high-energy pulse on the plasticity property of W-CeO2 rods was investigated. The effects of current density (J 0), pulse width (t w), frequency (f), and strain rate on the plasticity of W-CeO2 rods were discussed in detail. Results of tensile tests show that the W-CeO2 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.

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Acknowledgments

This study was financially supported by the National Key Technology R&D Program of China (No. 2012BAE06 B02) and the Beijing Municipal Science and Technology Project (No. Z141100003814008). This study is also in collaboration with the BGRIMM Advanced Materials Co. Ltd at Beijing.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China

    Wen-Guang Zhu, Jian-Can Yang, Jie Cao, Lin Huang, Yu-Chen Xi & Zuo-Ren Nie

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  1. Wen-Guang Zhu
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  2. Jian-Can Yang
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  3. Jie Cao
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  4. Lin Huang
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  5. Yu-Chen Xi
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  6. Zuo-Ren Nie
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Correspondence to Jian-Can Yang.

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Zhu, WG., Yang, JC., Cao, J. et al. Plasticity and microstructure evolution of W-CeO2 rods with different short-duration pulse currents. Rare Met. 36, 981–986 (2017). https://doi.org/10.1007/s12598-015-0629-8

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  • DOI: https://doi.org/10.1007/s12598-015-0629-8

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