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

Title
Methods to evaluate the twin formation energy: comparative studies of the atomic simulations and in-situ TEM tensile tests
Authors
안재평김홍규김성훈
Issue Date
2020-09
Publisher
한국현미경학회지; Applied Microscopy
Citation
VOL 50, 19
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.
URI
http://pubs.kist.re.kr/handle/201004/72154
ISSN
2287-5123
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KIST Publication > Article
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