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Subsurface deformation during Vickers indentation of bulk metallic glasses

Jana, S and Ramamurty, U and Chattopadhyay, K and Kawamura, Y (2004) Subsurface deformation during Vickers indentation of bulk metallic glasses. In: Materials Science and Engineering A, 375-37 . pp. 1191-1195.

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Abstract

Bonded interface technique was employed to examine the nature of subsurface deformation during Vickers indentation in two kinds of bulk metallic glasses (BMGs), $Pd_{42.1}Ni_{39.77}P_{18.13}$, and $Zr_{56.69}Cu_{26.96}Al_{10.95}Ni_{5.4.}$ Quantitative information such as the shear band spacing, pile-up length, subsurface deformation zone size etc. was recorded for indentation loads ranging from 50 to 5000 g. Experimental results show that both the BMGs have an average hardness value of $\sim$550 VHN with slightly higher hardness at low loads. Observations of deformation zones indicate that they deform appreciably through the shear band mechanism. For both bulk indentation, as well as the interface indentation, the normalized size of the deformation zone was found to be independent of the applied load. Two types of shear bands, radial, and semi-circular in nature, have been observed. These results are compared with similar studies made on ductile metals and silicate glasses.

Item Type: Journal Article
Additional Information: The copyright belongs to Elsevier.
Keywords: Bulk metallic glasses;Vickers indentation;Bonded interface technique;Shear band;Subsurface deformation
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 21 Apr 2006
Last Modified: 19 Sep 2010 04:25
URI: http://eprints.iisc.ernet.in/id/eprint/6382

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