An atomistic study of shear-band formation during cutting of metallic glasses

Using molecular dynamics simulations, we study the generation of plasticity during cutting of a CuZr metallic glass. We characterize the deformation occurring at different cutting depths and velocities. A regular pattern of parallel shear bands forms in the chip in agreement with experimental work....

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Bibliographic Details
Published in:Journal of applied physics 2020-03, Vol.127 (11)
Main Authors: Avila, Karina E., Küchemann, Stefan, Alabd Alhafez, Iyad, Urbassek, Herbert M.
Format: Article
Language:English
Subjects:
Amorphous materials
Applied physics
Case depth
Casting
Cutting parameters
Deformation
Edge dislocations
Icosahedral phase
Metallic glasses
Molecular dynamics
Shear bands
Workpieces
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Summary:Using molecular dynamics simulations, we study the generation of plasticity during cutting of a CuZr metallic glass. We characterize the deformation occurring at different cutting depths and velocities. A regular pattern of parallel shear bands forms in the chip in agreement with experimental work. The shear bands are better defined and further spaced apart for deeper cuts. For small cutting velocities ≤ 20 m / s, a sharp boundary plane separates the plastically deformed material in the chip from the virgin workpiece. This is the case even for the deepest cuts performed. The chip is of roughly prismatic shape; its thickness is determined by how fast the shear bands formed within the chip propagate. We find that at the core of a shear band, the number of full icosahedral clusters decreases by more than 50%. At higher cut velocities, we find bent shear bands and irregular shear-band patterns when shear bands merge.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5141336