International Journal of Technology Enhancements and Emerging Engineering Research (ISSN 2347-4289)

IJTEEE >> Volume 3 - Issue 4, April 2015 Edition

International Journal of Technology Enhancements and Emerging Engineering Research  
International Journal of Technology Enhancements and Emerging Engineering Research

Website: http://www.ijteee.org

ISSN 2347-4289

The Effect Of Fracture Toughness On The Plastic Deformation Of Tinb/Cu-Based And Tinb/Zr-Based Bulk Metallic Glassy Composites (Bmgcs).

[Full Text]



Aakash Kumar, Ajay Dhakad



Keywords: Composites; Bulk metallic glasses; fracture toughness; plasticity.



ABSTRACT: The fracture toughness is a critical material property that determines engineering performance. Because of the unique and distinctive mechanical properties of bulk Metallic glasses (BMGs), they have received substantial attention over a few decades. However, many of them exhibit poor plasticity because the deformation of these materials are highly confined to few shear bands. In this study, two kinds of bulk metallic glasses namely Cu-based and Zr-based Bulk Metallic Glass with no plastic strain are adopted as matrixes. Both of them were reinforced by crystalline TiNb with the same volume fraction and particle size. The data obtained by the loading tests showed that the plastic strain of Zr-based BMGCs was much higher than the Cr-based BMGCs. In this research we are relating changes in the plastic strain to the fracture toughness of the material. In the composite having high fracture toughness, the strength of the main crack is reduced due to the formation of micro-cracks on the surface of the specimen which simultaneously resulted in a large plastic strain in the Zr-based BMGCs. On the contrary, for the Cr based BMGCs, crack propagated rapidly throughout the volume, so no such micro-cracks were generated and thus the plastic strain generated in the latter was much less than the Zr-based BMGCs.



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