<i>In situ</i> measurements of a homogeneous to heterogeneous transition in the plastic response of ion-irradiated <111> Ni microspecimens [electronic resource].
- Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2015. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- pages 121-135 : digital, PDF file
- Additional Creators:
- Sandia National Laboratories, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- We report on the use of quantitative <i>in situ</i> 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 <i>in situ</i> 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.
- Published through SciTech Connect., 02/11/2015., "sand--2014-19390j", "540949", Acta Materialia 88 C ISSN 1359-6454 AM, and Xinyu Zhao; Daniel J. Strickland; Peter M. Derlet; Mo-rigen He; You -Jung Cheng; Jue Pu; Khalid Hattar; Daniel S. Gianola.
- Funding Information:
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