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김주영

Kim, Ju-Young
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Increased time-dependent room temperature plasticity in metallic glass nanopillars and its size-dependency

Author(s)
Yoo, Byung-GilKim, Ju-YoungKim, Yong-JaeChoi, In-ChulShim, SanghoonTsui, Ting Y.Bei, HongbinRamamurty, UpadrastaJang, Jae-il
Issued Date
2012-10
DOI
10.1016/j.ijplas.2012.04.005
URI
https://scholarworks.unist.ac.kr/handle/201301/3407
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84864674391
Citation
INTERNATIONAL JOURNAL OF PLASTICITY, v.37, pp.108 - 118
Abstract
Room temperature, uniaxial compression creep experiments were performed on micro-/nano-sized pillars (having diameters in the range of 250-2000 nm) of a Zr-based bulk metallic glass (BMG) to investigate the influence of sample size on the time-dependent plastic deformation behavior in amorphous alloys. Experimental results reveal that plastic deformation indeed occurs at ambient temperature and at stresses that are well below the nominal quasi-static yield stress. At a given stress, higher total strains accrue in the smaller specimens. In all cases, plastic deformation was found to be devoid of shear bands, i.e., it occurs in homogeneous manner. The stress exponent obtained from the slope of the linear relation between strain rate and applied stress also shows a strong size effect, which is rationalized in terms of the amount of free volume created during deformation and the surface-to-volume ratio of the pillar.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
ISSN
0749-6419
Keyword (Author)
Metallic glassTime-dependent plasticityNanomechanical propertiesSize effectNanopillar
Keyword
FREE-VOLUME MODELAMORPHOUS-ALLOYSAS-CASTDEFORMATIONCOMPRESSIONFLOWNANOINDENTATIONTRANSITIONBEHAVIORCREEP

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