special boundaries during the annealing process. Through analysis showed that the reasons and causes the formation of 71.4°/<11﹣20> special boundaries are not the same as the ∑3 twin boundaries which were formed in the retained FCC phase; 71.4°/<11﹣20> is formed as a result of phase transformation from FCC to HCP, following the Shoji-Nishiyama orientation relationship."/>
Research annealed polycrystalline pure cobalt twinning organization change laws
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Chongqing University,Chongqing University,Chongqing University,Chongqing University,chongqing university
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Abstract:
This paper is the use of X-ray diffraction (XRD) techniques and electron backscatter diffraction (EBSD) technique to research the variation of polycrystalline pure cobalt tissue which is annealed at different temperatures. The results showed that:∑3 twin boundaries were observed in the retained FCC phase and we also find the number of grains having such a characteristic is not changed with annealing temperature, basically stable. Meanwhile, having a hexagonal close-packed (HCP) structure formed large grains of 71.4°/<11﹣20> special boundaries during the annealing process. Through analysis showed that the reasons and causes the formation of 71.4°/<11﹣20> special boundaries are not the same as the ∑3 twin boundaries which were formed in the retained FCC phase; 71.4°/<11﹣20> is formed as a result of phase transformation from FCC to HCP, following the Shoji-Nishiyama orientation relationship.
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[Jin Jiabing, Zhang Xiyan, Chen Jianhua, Zhu Yutao, liuqing. Research annealed polycrystalline pure cobalt twinning organization change laws[J]. Rare Metal Materials and Engineering,2016,45(2):353~357.] DOI：[doi]