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Modeling and Characterization of Mechanical Behavior of MaterialsNo Access

COMPUTATIONAL STUDY OF TENSILE DEFORMATION OF A CONSTRAINED NANOSCALE METALLIC GLASS

School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore

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School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore

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Department of Building and Construction, City University of Hong Kong, Hong Kong

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https://doi.org/10.1142/S0217979210064241Cited by:1 (Source: Crossref)

Abstract

In this study a nanometer-sized metallic glass (nano-MG) Ti₅₀Cu₅₀ was generated with constrained atoms at both ends and was extended until fracture under a tensile load by molecular dynamics simulation using the general embedded-atom model (GEAM) potential. Totally different mechanical behavior was observed in the nano-MG, such as strain hardening and necking, both of which have been discovered in a few real and simulated MGs and can be related to the generation of shear transformation zones (STZs). A dramatic drop in Young's modulus was found due to the surface effect. Such effect results from the large fraction of surface atoms which have a different surrounding configuration from bulk atoms. At fracture the nano-MG breaks by atomic separation as reported in metal nanowires. The fracture strain is as large as about 120%, indicating that nano-MGs are intrinsically ductile.

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