Applied Microscopy

  • 제50권
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  • Pages.19.1-19.9
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  • 2020
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  • 2287-5123(pISSN)
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  • 2287-4445(eISSN)
한국현미경학회 (Korean Society of Microscopy)
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Methods to evaluate the twin formation energy: comparative studies of the atomic simulations and in-situ TEM tensile tests

  • Hong-Kyu Kim (Advanced Analysis Center, Korea Institute of Science and Technology) ;
  • Sung-Hoon Kim (Advanced Analysis Center, Korea Institute of Science and Technology) ;
  • Jae-Pyoung Ahn (Advanced Analysis Center, Korea Institute of Science and Technology)
  • 투고 : 2020.08.03
  • 심사 : 2020.09.08
  • 발행 : 2020.12.31
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초록

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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과제정보

This work was supported by the KIST R&D program of 2 V08170.

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