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In situ measurements of a homogeneous to heterogeneous transition in the plastic response of ion-irradiated <111> Ni microspecimens

Journal Article · · Acta Materialia
 [1];  [1];  [2];  [1];  [1];  [3];  [4];  [1]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States)
  2. Paul Scherrer Institut, Villigen PSI (Switzerland)
  3. Univ. of Pennsylvania, Philadelphia, PA (United States); Stanford Univ., Stanford, CA (United States)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
We report on the use of quantitative in situ microcompression experiments in a scanning electron microscope to systematically investigate the effect of self-ion irradiation damage on the full plastic response of <111> Ni. In addition to the well-known irradiationinduced increases in the yield and flow strengths with increasing dose, we measure substantial changes in plastic flow intermittency behavior, manifested as stress drops accompanying energy releases as the driven material transits critical states. At low irradiation doses, the magnitude of stress drops reduces relative to the unirradiated material and plastic slip proceeds on multiple slip systems, leading to quasi-homogeneous plastic flow. In contrast, highly irradiated specimens exhibit pronounced shear localization on parallel slip planes, which we ascribe to the onset of defect free channels normally seen in bulk irradiated materials. Our in situ testing system and approach allows for a quantitative study of the energy release and dynamics associated with defect free channel formation and subsequent localization. As a result, this study provides fundamental insight to the nature of interactions between mobile dislocations and irradiation-mediated and damage-dependent defect structures.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1184583
Alternate ID(s):
OSTI ID: 22452895
OSTI ID: 1430757
Report Number(s):
SAND--2014-19390J; 540949
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 88; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Orthogonal Control of Stability and Tunable Dry Adhesion by Tailoring the Shape of Tapered Nanopillar Arrays journal October 2015
Avalanches and plastic flow in crystal plasticity: an overview journal December 2017
Avalanches and Plastic Flow in Crystal Plasticity: An Overview text January 2017

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