Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/14307
Title: Indentation studies on a Zr-based bulk metallic glass
Authors: TANG CHUNGUANG
Keywords: bulk metallic glass, spherical indentation, nanoindentation, mechanical properties, hardness, shear bands
Issue Date: 9-Nov-2004
Source: TANG CHUNGUANG (2004-11-09). Indentation studies on a Zr-based bulk metallic glass. ScholarBank@NUS Repository.
Abstract: In this project, the mechanical properties of bulk metallic glass Zr52.5Ti5Cu17.9Ni14.6Al10 were studied using a spherical diamond indenter. The mean pressures increased gradually to and saturate at 5.5 GPa. In the fully plastic stage, shear bands in spiral shape occurred around the spherical indentation, which was discussed in the frame of contact mechanics on spherical indentation. Nanoindentations were conducted to probe the influences of the residual spherical indentation impressions on the properties of specimens. The nanoindentation hardness reduced around the residual indentation. This was attributed to the interactions between the pre-introduced shear bands by the spherical indentation and the new ones by nanoindentations. Such interactions were further investigated by conducting nanoindentations at low loading rates and were found to have influences on the serrated plastic flow behavior of bulk metallic glasses.
URI: http://scholarbank.nus.edu.sg/handle/10635/14307
Appears in Collections:Master's Theses (Open)

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