Medium-range Orders in Amorphous Alloys and Their Role on the Plasticity: A Molecular Dynamics Viewpoint Study
- Medium-range Orders in Amorphous Alloys and Their Role on the Plasticity: A Molecular Dynamics Viewpoint Study
- 이창면; 이미림; 이광렬; 강경한; 이병주; 이재철
- amorphous materials; deformation; computer simulation; short(medium)-range order
- Issue Date
- 대한금속 . 재료학회지; Journal of the Korean Institute of Metals and Materials
- VOL 48, NO 2, 101-108
- The local structural states of amorphous alloys have been depicted previously via short-range
orders (SROs). However, the concept of SROs alone is inadequate and sometimes insufficient to explain the
structure-property relation of the amorphous alloys. In this study, we propose new types of medium-range
building structures that affect the mechanical properties, plasticity in particular. Using a combination of
molecular dynamics simulations and the Voronoi tessellation method, we demonstrate a three-dimensional
configuration of icosahedral medium-range orders (I-MROs) and elucidate how these icosahedral orders evolve
by the application of shear deformation. It was observed that the structural stability of the icosahedral orders
relies largely on how they are linked via percolation and this linking is explained in detail.
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