Plastic flow and failure resistance of metallic glass: Insight from in situ compression of nanopillars

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aluminium alloys
compressive testing
copper alloys
ductility
metallic glasses
plastic flow
size effect
transmission electron microscopy
zirconium alloys
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Shan, Z. W
Cheng, Y. Q
Minor, A. M.
Syed Asif, S. A
Warren, O. L.
Ma, E.
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Abstract

We report in situ nanocompression tests of Cu-Zr-Al metallic glass (MG) pillars in a transmission electron microscope. This technique is capable of spatially and temporally resolving the plastic flow in MGs. The observations reveal the intrinsic ability of fully glassy MGs to sustain large plastic strains, which would otherwise be preempted by catastrophic instability in macroscopic samples and conventional tests. The high ductility in volume-limited MGs and the sample size effects in suppressing the rapid failure common to MGs are analyzed by modeling the evolution of the collectivity of flow defects toward localization.

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2008-04-14
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Copyright American Physical Society. Reprinted from Physical Review B, Volume 77, Article 155419, April 2008, 6 pages. Publisher URL: http://dx.doi.org/10.1103/PhysRevB.77.155419
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