Rate-dependent serrated flow and plastic deformation in Ti45Zr16Be20Cu10Ni9 bulk amorphous alloy during nanoindentation

The plastic deformation of Ti 45 Zr 16 Be 20 Cu 10 Ni 9 bulk metallic glass has been investigated by nanoindentation performed with loads ranging from 10 to 200 mN in a wide range of loading rates. The plastic flow in the alloy exhibited conspicuous serrations at low loading rates. The serrations, h...

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Bibliographic Details
Published inScience and technology of advanced materials Vol. 9; no. 4; p. 045004
Main Authors Kumar Misra, Dinesh, Woo Sohn, Sung, Tae Kim, Won, Hyang Kim, Do
Format Journal Article
LanguageEnglish
Published Taylor & Francis 01.12.2008
IOP Publishing
Taylor & Francis Group
Subjects
AFM
metallic glass
nanoindentation
TEM
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Summary:The plastic deformation of Ti 45 Zr 16 Be 20 Cu 10 Ni 9 bulk metallic glass has been investigated by nanoindentation performed with loads ranging from 10 to 200 mN in a wide range of loading rates. The plastic flow in the alloy exhibited conspicuous serrations at low loading rates. The serrations, however, became less prominent as the rate of indentation increased. Atomic force microscopy showed a significant pile-up of materials around the indents, indicating that a highly localized plastic deformation occurred under nanoindentation. The possible mechanism governing the plastic deformation in bulk metallic glass specimens is tentatively discussed in terms of strain-induced free volume.
Bibliography:ObjectType-Article-1
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ISSN:1468-6996
1878-5514
DOI:10.1088/1468-6996/9/4/045004