Grain refinement process in a cold-rolled polycrystalline cobalt

被引：18
作者：
An, Xinglong [1 ]
Li, Yan [1 ]
Ni, Song [1 ]
Wang, Zhangwei [2 ]
Song, Min [1 ]
机构：
[1] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
[2] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany
来源：
MATERIALS CHARACTERIZATION | 2020年 / 164卷
关键词：
Cobalt; Deformation behavior; Grain refinement; Phase transformation; Twinning; STRUCTURAL-CHARACTERIZATION; TWINNING SYSTEMS; DEFORMATION; MECHANISMS; TRANSFORMATION; EVOLUTION; TWINS; MICROSTRUCTURE; BOUNDARIES; VARIANTS;
D O I：
10.1016/j.matchar.2020.110360
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 similar to 71 degrees/ < 11<(2)over bar>0>, together with deformation induced twinning and phase transformation, refine the grain size from 20 mu m 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.
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页数：7
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