Influence of electropulsing treatment on the recrystallization and texture of Ni9W alloy strip
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Wei Liu Department of Materials Science and Engineering, Key Laboratory of Advanced Materials, Tsinghua University, Haidian District, Beijing 100084, China
Guoyi Tanga) Advanced Materials Institute and Cleaner Production Key Laboratory, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; and Department of Materials Science and Engineering, Key Laboratory of Advanced Materials, Tsinghua University, Haidian District, Beijing 100084, China
Rufei Zhu Department of Materials Science and Engineering, Key Laboratory of Advanced Materials, Tsinghua University, Haidian District, Beijing 100084, China (Received 11 October 2013; accepted 16 December 2013)
The effects of electropulsing treatment (EPT) on the recrystallization and texture of Ni9W alloy were investigated using micro-hardness and electron backscattered diffraction patterns. It is found that compared with conventional annealing, EPT tremendously accelerates the recrystallization process of Ni9W alloy. Moreover, the full recrystallization temperature of EPT is decreased by ;180 °C. The rapid recrystallization process is attributed to the substantial increase in the atomic flux resulting from the athermal effect. EPT also significantly reduces the intensity of cube texture after full recrystallization. The evolution of recrystallization microstructure and texture reveals that EPT greatly increases the proportion of noncube oriented nuclei but has little effect on the size advantage of cube grains. It is suggested that the change of recrystallization texture results from the different effects of EPT on cube band nucleation and shear band nucleation.
I. INTRODUCTION
Electropulsing treatment (EPT), as a new developing process, has been found to greatly change the recrystallization behaviors of various alloys.1,2 Conrad et al.3,4 found that electropulsing could enhance the nucleation rate of recrystallization and refine the grain size of copper. Xu et al.5,6 obtained ultra-fine recrystallization grains in the cold-rolled AZ31 and brass strip by EPT. Hu et al.7 found that the Goss texture is favorable to form under an adequate electropulsing in the cold-rolled Fe–3Si alloy strip. In addition, some mechanisms were proposed to explain the effects of EPT on recrystallization. Sprecher et al.8 proposed that an electron wind force induced by electropulsing can assist the mobility of dislocation. Du et al.9 pointed out that the transient thermal compressive stress caused by EPT can enhance the nucleation rate. Guan et al.10 proposed that an extra driving force caused by electropulsing can increase the a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2014.3 596
J. Mater. Res., Vol. 29, No. 4, Feb 28, 2014
http://journals.cambridge.org
Downloaded: 15 Mar 2015
velocity of the moving boundary. However, the understanding of the mechanism pertaining to the effects of electropulsing on recrystallization, especially the relationship between deformation microstructure and recrystallization texture, is still rud
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