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The effects of electropulsing on the recrystallization behavior of rolled pure tungsten

Published online by Cambridge University Press:  19 September 2012

Yue Yuan ,
Wei Liu ,
Baoqin Fu ,
Haiyan Xu ,
Guangnan Luo ,
Guoyi Tang  and
Yanbin Jiang
Yue Yuan
Affiliation:
Department of Materials Science and Engineering, Laboratory of Advanced Materials, Tsinghua University, Beijing 100084, China
Wei Liu*
Affiliation:
Department of Materials Science and Engineering, Laboratory of Advanced Materials, Tsinghua University, Beijing 100084, China
Baoqin Fu
Affiliation:
Department of Materials Science and Engineering, Laboratory of Advanced Materials, Tsinghua University, Beijing 100084, China
Haiyan Xu
Affiliation:
Department of Materials Science and Engineering, Laboratory of Advanced Materials, Tsinghua University, Beijing 100084, China
Guangnan Luo
Affiliation:
Division of Tokamak Physics, Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
Guoyi Tang
Affiliation:
Department of Materials Science and Engineering, Advanced Materials Institute, Graduate School at ShenzhenTsinghua University, Shenzhen 518055, China
Yanbin Jiang
Affiliation:
Department of Materials Science and Engineering, Key Laboratory for Advanced Materials Processing (MOE), University of Science and Technology Beijing, Beijing 100083, China
*
a)Address all correspondence to this author. e-mail: liuw@mail.tsinghua.edu.cn
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Abstract

Electropulsing treatment (EPT) has been first applied to the recrystallization of a refractory metal—tungsten (W). We have three major observations: (i) the recrystallization temperature of a rolled pure W under EPT is ∼900 K higher than its conventional recrystallization temperature (1603 K); (ii) the time required for recrystallization is significantly reduced compared with that of conventional heat treatment (CHT); (iii) the recrystallized grains are also much finer than the ones under CHT. Based on quantitative analysis, we conclude that the huge increase of the recrystallization temperature of the rolled pure W under EPT is due to the high heating rate generated by EPT and high activation energy for vacancy diffusion of W, and the accelerated recrystallization and grain refinement have resulted from the coupling of thermal and electromigration effects of EPT at relatively high temperatures.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 20 , 28 October 2012 , pp. 2630 - 2638
Copyright
Copyright © Materials Research Society 2012

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References

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