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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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Fabrication, structure and mechanical properties of indium nanopillars

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Title
Fabrication, structure and mechanical properties of indium nanopillars
Author
Lee, GyuhyonKim, Ju-YoungBudiman, Arief SuriadiTamura, NobumichiKunz, MartinChen, KaiBurek, Michael J.Greer, Julia R.Tsui, Ting Y.
Keywords
Compression test; Electroplating; Plastic deformation; X-ray diffraction; Yield phenomena
Issue Date
2010-02
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ACTA MATERIALIA, v.58, no.4, pp.1361 - 1368
Abstract
Solid and hollow cylindrical indium pillars with nanoscale diameters were prepared using electron beam lithography followed by the electroplating fabrication method. The microstructure of the solid-core indium pillars was characterized by scanning micro-X-ray diffraction, which shows that the indium pillars were annealed at room temperature with very few dislocations remaining in the samples. The mechanical properties of the solid pillars were characterized using a uniaxial microcompression technique, which demonstrated that the engineering yield stress is ∼9 times greater than bulk and is ∼1/28 of the indium shear modulus, suggesting that the attained stresses are close to theoretical strength. Microcompression of hollow indium nanopillars showed evidence of brittle fracture. This may suggest that the failure mode for one of the most ductile metals can become brittle when the feature size is sufficiently small.
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DOI
10.1016/j.actamat.2009.10.042
ISSN
1359-6454
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MSE_Journal Papers
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