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12 results

  • Understanding plasticity in irradiated alloys through TEM in situ compression pillar tests

  • Haozheng J. Qu, Kayla H. Yano, Priyam V. Patki, Matthew J. Swenson, Janelle P. Wharry
  • Journal:
    Journal of Materials Research / Volume 35 / Issue 8 / 28 April 2020
    Published online by Cambridge University Press:
    22 October 2019, pp. 1037-1050
    Print publication:
    28 April 2020
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  • Depth-sensing transmission electron microscopic (TEM) in situ mechanical testing has become widely utilized for understanding deformation in irradiated materials. Until now, compression pillars have primarily been used to study the elastic properties and yield of irradiated materials. In this study, we utilize TEM in situ compression pillars to investigate plastic deformation in two ion-irradiated alloys: Fe–9% Cr oxide dispersion strengthened (ODS) alloy and nanocrystalline Cu–24% Ta. We develop an algorithm to automate the extraction of instantaneous pillar dimensions from TEM videos, which we use to calculate true stress–strain curves and strain hardening exponents. True stress–strain curves reveal intermitted plastic flow in all specimen conditions. In the Fe–9% Cr ODS, intermitted plastic flow is linked to strain bursts observed in TEM videos. Low strain hardening or strain softening is observed in all specimen conditions. TEM videos link the strain softening in irradiated Fe–9% Cr ODS to dislocation cross-slip, and in Cu–24% Ta to grain boundary sliding.

  • In situ TEM Fracture Testing for Shallow Ion Irradiated Layers

  • Janelle P. Wharry, Kayla H. Yano
  • Journal:
    Microscopy and Microanalysis / Volume 23 / Issue S1 / July 2017
    Published online by Cambridge University Press:
    04 August 2017, pp. 738-739
    Print publication:
    July 2017
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