期刊
MATERIALS LETTERS
卷 59, 期 24-25, 页码 3090-3094出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2005.05.041
关键词
bulk metallic glasses; plastic deformation; nanoindentation
The plastic deformation of two Zr-based bulk metallic glasses (BMGs), Zr55Cu30Ni5Al10 and Zi(69.5)Cu(12)Ni(11)Al(7.5), was investigated by instrumented nanoindentation over a broad range of loading rates. It was found that the plastic flow of the two BMGs exhibited conspicuous serrations at low loading rates. The serrations, however, became less prominent as the rate of indentation increased. AFM showed a significant pile-up of materials around the indents, indicating that a highly localized plastic deformation occurred under nanoindentation. The mechanism governing the plastic deformation in BMGs was tentatively discussed in terms of the mode of strain-induced free volume. (C) 2005 Elsevier B.V. All rights reserved.
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