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Korean Journal of Metals and Materials > Volume 54(9); 2016 > Article
Korean Journal of Metals and Materials 2016;54(9): 711-715. doi: https://doi.org/10.3365/KJMM.2016.54.9.711
미세쌍정의 투과전자현미경 해석
류근걸, 하미영, 이강득
순천향대학교 디스플레이신소재공학과
Transmission Electron Microscopic Analysis of Micro-Twin
Kun Kul Ryoo, Mi-young Ha, Kang Deuk Lee
Department of Display Materials Engineering, SoonChunHyang University, Asan 31538, Republic of Korea
Correspondence  Kun Kul Ryoo ,Tel: +82-41-530-1380, Email: kraten@sch.ac.kr
Received: 29 December 2015;  Accepted: 20 March 2016.  Published online: 5 September 2016.
ABSTRACT
Micro-twinning has been investigated in some state-of-the-art materials by transmission electron microscopy, but such characterizations have not been clear so far. Micro-twins must be characterized by identifying their spots in the electron diffraction pattern, which is very unique compared to normal defects such as dislocations or stacking faults. In this study the electron diffraction pattern which should be developed by micro-twins was derived theoretically for the [011] beam direction assuming that the symmetrical mirror plane was {112}. The angles between the diffraction spots of the (200) and (ī1ī) planes were concluded to be 15.7°. This conclusion could be utilized as an indicator of the likely offset of crystal rotations or stress relaxations due to micro-twinning formation. The presence of micro-twinning should also be confirmed, by making sure that twin spots appear in the diffraction patterns and micro-twin images in dark field.
Keywords: nanostructured materials, deformation, twinning, transmission electron microscopy(TEM), fcc crystal
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