Open Access

ARTICLE

Thickness Effect of Nanocrystalline Layer on the Deformation Mechanism of Amorphous/Crystalline Multilayered Structure

by Wen-Jay Lee¹, Yu-Chien Lo², Anchen Yang³, Kuanpeng Chen³, Nan-Yow Chen³

1 National Center for High-Performance Computing, No. 22, Keyuan Rd., Central Taiwan Science Park, Taichung City 40763, Taiwan.
2 Department of Materials Science and Engineering, National Chiao Tung University, No. 1001 University Rd., Hsinchu 30010, Taiwan.
3 National Center for High-Performance Computing, No. 7, R&D 6th Rd., Hsinchu Science Park, Hsinchu City 30076, Taiwan.

* Corresponding Author: Wen-Jay Lee. Email: .

(This article belongs to the Special Issue: Nano/Micro Structures in Application of Computational Mechanics)

Computer Modeling in Engineering & Sciences 2019, 120(2), 293-304. https://doi.org/10.32604/cmes.2019.06620

Abstract

Different thickness of amorphous/nanocrystalline multi-layered structure can be used to modulate the strength and ductility of the composite materials. In this work, molecular dynamics simulations were conducted to study the thickness effect of nanocrystalline layer on mechanical properties and deformation behavior of the Cu₆₄Zr₃₆/Cu multi-layer structure. The stress-strain relationship, local stress, local strain, and deformation mechanism are investigated. The results reveal that the change of thickness of the crystalline layer significantly affects the mechanical properties and deformation behavior. As the strain at the elastic region, the amorphous Cu₆₄Zr₃₆ layer dominates the mechanical behavior, leading the fact that Young’s modulus, first yielding stress, and first yielding strain are close to that of Cu₆₄Zr₃₆ BMG. As the strain at the plastic region, the contribution of the crystalline layer on the mechanical behavior becomes more and more significant with increasing the thickness of the crystalline layer. For the thickness ratio (amorphous/crystalline) of 4, the shear band deformation of amorphous layer dominates the mechanical properties. For the thickness ratio is 1, the glide dislocation of the crystalline layer dominates the stress-strain behavior.

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