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Methods to evaluate the twin formation energy: comparative studies of the atomic simulations and in-situ TEM tensile tests

Applied Microscopy 2020년 50권 1호 p.19 ~ 19
김홍규, 김성훈, 안재평,
소속 상세정보
김홍규 ( Kim Hong-Kyu ) - Korea Institute of Science and Technology Advanced Analysis Center
김성훈 ( Kim Sung-Hoon ) - Korea Institute of Science and Technology Advanced Analysis Center
안재평 ( Ahn Jae-Pyoung ) - Korea Institute of Science and Technology Advanced Analysis Center

Abstract


Deformation twinning, one of the major deformation modes in a crystalline material, has typically been analyzed using generalized planar fault energy (GPFE) curves. Despite the significance of these curves in understanding the twin nucleation and its effect on the mechanical properties of crystals, their experimental validity is lacking. In this comparative study based on the first-principles calculation, molecular dynamics simulation, and quantitative in-situ tensile testing of Al nanowires inside a transmission electron microscopy system, we present both a theoretical and an experimental approach that enable the measurement of a part of the twin formation energy of the perfect Al crystal. The proposed experimental method is also regarded as an indirect but quantitative means for validating the GPFE theory.

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