Transactions of Materials and Heat Treatment

Title：Analysis on the twinning of FCC metals by EBSD

Authors： Chen Qiangqiang Song Guangsheng Xu Yong Zhang Shihong

Unit： Shenyang Aerospace University Institute of Metal Research Chinese Academy of Sciences

KeyWords： FCC crystals twin EBSD superalloy

ClassificationCode：TG146

year,vol(issue):pagenumber：2015,40(5):140-144

Abstract：

The twinning characteristic of crystal was described by the electron backscatter diffraction (EBSD) technology by the way of rotation angle combined with rotation axis. In general research, it was described by the way of twinning plane combined with twinning direction. Based on crystallographic theory of twinning，the conversion method between the two description ways mentioned above was deduced. For the four {111}<112> twinning variants of face-centered cubic (FCC) metals, two description forms were obtained，and the corresponding relationship between the two description ways was built. The relationship shows that the twinning plane and twinning direction of a specific variant of FCC metals can be determined by EBSD. At last, based on measured results of EBSD, the twinning variants of GH690 and GH145 Ni based superalloys were analyzed by the above relationship. Analysis results show that all the four 60°<111> twin variants usually activate during the deformation.

Funds：

国家自然科学基金资助项目(50775211, 51174189); 辽宁省教育厅资助项目（L2011024）

陈强强(1988-)，男，硕士研究生宋广胜(1971-)，男，博士，副教授

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