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Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Compression Behavior of Mg-Cu-Gd Bulk Metallic Glasses with Various Specimen Height to Diameter Ratios
H. M. ChenY. C. ChangT. H. HungX. H. DuJ. C. HuangJ. S. C. JangP. K. Liaw
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2007 Volume 48 Issue 7 Pages 1802-1805

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Abstract

The mechanical behavior of the Mg65Cu25Gd10 bulk metallic glasses (BMGs) in term of compression testing is reported in this study. Room-temperature compression tests are conducted on specimens with various height to diameter ratios (hd) from 2:1, 1:1, 1:2, to 1:4. The failure strength, deformation strain, and the fracture surface morphologies are seen to vary systematically in accordance with the specimen hd ratio. For specimens with hd of 2:1 or 1:1, the compression response is similar to those in most reports. In contrast, for specimens with lower hd ratios, especially at hd=1:4 (or 0.25), the shear band propagation appears to be constrained, resulting in the enhanced ductility. It suggests that different deformation mechanisms are operative for specimens with different hd ratios. The possible deformation mechanisms in specimens of different geometries are discussed.

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© 2007 The Japan Institute of Metals and Materials
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