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Kim, Ju-Young
Robust Multifunctional Materials Lab
Research Interests
  • Flexible / stretchable devices, nano-mechanics, nanoporous metal, materials reliability

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Tensile and compressive behavior of gold and molybdenum single crystals at the nano-scale

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Title
Tensile and compressive behavior of gold and molybdenum single crystals at the nano-scale
Author
Kim, Ju-YoungGreer, Julia R.
Keywords
Compression test; Plastic deformation; Tension test; Tension-compression asymmetry
Issue Date
2009-10
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ACTA MATERIALIA, v.57, no.17, pp.5245 - 5253
Abstract
In situ mechanical tests were carried out to measure the tensile behavior of single-crystalline face-centered cubic (fcc) gold (Au) and body-centered cubic (bcc) molybdenum (Mo) nano-pillars with diameters between 250 and 1 μm, and to compare this with the compression results of these materials at the equivalent sizes. In Au, we observed similar tensile and compressive flow stresses at ∼10% strain although strain-hardening in tension is somewhat more pronounced than it is in compression. In Mo, the amount of strain-hardening in tension is significantly lower than that in compression, leading to a distinct tension-compression asymmetry in the flow stress at ∼5% strain. The dissimilarities between tensile and compressive behavior in both crystals are discussed in terms of sample geometry constraints and dislocation behavior in bcc crystals.
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DOI
:10.1016/j.actamat.2009.07.027
ISSN
1359-6454
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MSE_Journal Papers
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