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

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1184583
Alternate Identifier(s):
OSTI ID: 1430757
Report Number(s):
SAND-2014-19390J
Journal ID: ISSN 1359-6454; 540949
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 88; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; radiation effects; stress/strain relationship; nuclear materials

Citation Formats

Zhao, Xinyu, Strickland, Daniel J., Derlet, Peter M., He, Mo-rigen, Cheng, You -Jung, Pu, Jue, Hattar, Khalid, and Gianola, Daniel S. In situ measurements of a homogeneous to heterogeneous transition in the plastic response of ion-irradiated <111> Ni microspecimens. United States: N. p., 2015. Web. doi:10.1016/j.actamat.2015.01.007.
Zhao, Xinyu, Strickland, Daniel J., Derlet, Peter M., He, Mo-rigen, Cheng, You -Jung, Pu, Jue, Hattar, Khalid, & Gianola, Daniel S. In situ measurements of a homogeneous to heterogeneous transition in the plastic response of ion-irradiated <111> Ni microspecimens. United States. https://doi.org/10.1016/j.actamat.2015.01.007
Zhao, Xinyu, Strickland, Daniel J., Derlet, Peter M., He, Mo-rigen, Cheng, You -Jung, Pu, Jue, Hattar, Khalid, and Gianola, Daniel S. Wed . "In situ measurements of a homogeneous to heterogeneous transition in the plastic response of ion-irradiated <111> Ni microspecimens". United States. https://doi.org/10.1016/j.actamat.2015.01.007. https://www.osti.gov/servlets/purl/1184583.
@article{osti_1184583,
title = {In situ measurements of a homogeneous to heterogeneous transition in the plastic response of ion-irradiated <111> Ni microspecimens},
author = {Zhao, Xinyu and Strickland, Daniel J. and Derlet, Peter M. and He, Mo-rigen and Cheng, You -Jung and Pu, Jue and Hattar, Khalid and Gianola, Daniel S.},
abstractNote = {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.},
doi = {10.1016/j.actamat.2015.01.007},
journal = {Acta Materialia},
number = C,
volume = 88,
place = {United States},
year = {Wed Feb 11 00:00:00 EST 2015},
month = {Wed Feb 11 00:00:00 EST 2015}
}

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Cited by: 19 works
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Works referencing / citing this record:

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