Grain refinement process in a cold-rolled polycrystalline cobalt

An, Xinglong; Li, Yan; Ni, Song; Wang, Zhangwei; Song, Min

doi:10.1016/j.matchar.2020.110360

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Grain refinement process in a cold-rolled polycrystalline cobalt

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Wang, Zhangwei
High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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An, X., Li, Y., Ni, S., Wang, Z., & Song, M. (2020). Grain refinement process in a cold-rolled polycrystalline cobalt. Materials Characterization, 164: 110360. doi:10.1016/j.matchar.2020.110360.

Cite as: https://hdl.handle.net/21.11116/0000-0009-6BB7-1

Abstract

The microstructural evolution of a cold-rolled polycrystalline cobalt (Co) was investigated via electron backscatter diffraction, electron channeling contrast imaging and transmission electron microscope. High fraction of pre-existed phase transformation related boundaries (PBs) with misorientation of ~71°/<112¯0>, together with deformation induced twinning and phase transformation, refine the grain size from 20 μm in the un-deformed Co to nano scale before fracture. The grain refinement arises from the interplays among PBs, twins, and face centered cubic (FCC) plates, which is fundamentally different from grain refinement mechanisms reported in other hexagonal close-packed (HCP) materials. © 2020 Elsevier Inc.