Effect of size and strain rate on deformation behaviour of Cu50Zr50 metallic glass: A molecular dynamics simulation study

Dhal, Satyanarayan and Yadlapalli, Raja (2012) Effect of size and strain rate on deformation
behaviour of Cu50Zr50 metallic glass: A molecular dynamics simulation study. BTech thesis.

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Abstract

Metallic glasses or amorphous metals have attracted considerable attention due to their unique properties and have been evolved as a potential field of research in recent years. The recent discovery of new glass-forming compositions makes it possible to produce metallic glasses in bulk shapes. Bulk metallic glasses provides a promising future to revolutionize the field of structural materials with combinations of strength, elastic limit, toughness, wear resistance and corrosion resistance. Some of their superior properties over crystalline metals have made them a versatile engineering material for many commercial applications now-a-days. Since the fabrication of metallic glasses require high cooling rates and sometimes practically impossible in laboratory conditions, so computational approaches are extensively used to explore various properties and behaviour of metallic glasses.
This project work presents a molecular dynamics simulation study on deformation behaviour of Cu50Zr50 metallic glass where the effect of parameters like sample-size and strain rate on the tensile deformation behaviour have been thoroughly studied. Computational methods to create alloy models, subsequent quenching and further tensile deformation have been mentioned. Stress-strain plots were drawn at same strain rate for different sizes of alloy models and at different strain rates for a particular size. Reasons for getting different stress-stress curves for different conditions have also been discussed.