Revealing cryogenic mechanical behavior and mechanisms in a microstructurally-stable, immiscible nanocrystalline alloy

B. C. Hornbuckle, C. Kale, S. Srinivasan, T. L. Luckenbaugh, Kiran Solanki, K. A. Darling

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Here, the Cottrell–Stokes ratio in a microstructurally-stable Cu-3Ta (at.%) nanocrystalline alloy is examined from the standpoint of changes in deformation mechanisms. Toward this, uniaxial compression experiments were performed in the temperature range of 113 K – 273 K. The Cottrell-Stokes ratio at the lowest temperature tested was ~1.3, and the material exhibited a very low strain-rate sensitivity at cryogenic-temperatures. Transmission electron microscopy (TEM) characterization showed negligible average grain size coarsening and a transition in the deformation mechanism toward athermal activation processes such as twinning with the reduction in the testing temperature.

Original languageEnglish (US)
Pages (from-to)33-38
Number of pages6
JournalScripta Materialia
Volume160
DOIs
StatePublished - Feb 1 2019

Keywords

  • Cryogenic-temperature
  • Nanocrystalline
  • Transmission electron microscopy
  • Zener-Hollomon parameter

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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