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Title: Chemically-biased diffusion and segregation impede void growth in irradiated Ni-Fe alloys

Abstract

Recent irradiations of Ni-Fe concentrated solid solution alloys have demonstrated significant improvement of radiation performance. This improvement is attributed to redistribution of the alloying elements near sinks of point defects (voids, dislocations) due to chemically-biased atomic diffusion, where vacancies have preference to migrate via Fe atoms and interstitials via Ni atoms. In Ni-Fe, all sinks are enriched by Ni atoms, which strongly affects further interactions of radiation-produced mobile defects with voids and dislocations, hence void growth and dislocation climb. Ni-decorated sinks interact stronger with interstitial atoms than vacancies, which enhances dislocation loops growth. At the same time, Ni segregation creates Fe-enriched “channels” for vacancy migration out of the damage region to agglomerate in the outer regions, inaccessible to interstitial atoms. Furthermore, strong effect of chemically-biased diffusion is supported by transmission electron microscope characterization and calls for special attention in designing alloys with desired properties through tuning defect mobilities.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [2];  [1];  [1]; ORCiD logo [2]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1542244
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Current Opinion in Solid State and Materials Science
Additional Journal Information:
Journal Volume: 23; Journal Issue: 2; Journal ID: ISSN 1359-0286
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; Metallic alloys; Ni-Fe; Ion irradiation; Component segregation; Swelling

Citation Formats

Barashev, Alexander V., Osetsky, Yuri N., Bei, Hongbin, Lu, Chenyang, Wang, Lumin, and Zhang, Yanwen. Chemically-biased diffusion and segregation impede void growth in irradiated Ni-Fe alloys. United States: N. p., 2018. Web. doi:10.1016/j.cossms.2018.12.001.
Barashev, Alexander V., Osetsky, Yuri N., Bei, Hongbin, Lu, Chenyang, Wang, Lumin, & Zhang, Yanwen. Chemically-biased diffusion and segregation impede void growth in irradiated Ni-Fe alloys. United States. doi:10.1016/j.cossms.2018.12.001.
Barashev, Alexander V., Osetsky, Yuri N., Bei, Hongbin, Lu, Chenyang, Wang, Lumin, and Zhang, Yanwen. Mon . "Chemically-biased diffusion and segregation impede void growth in irradiated Ni-Fe alloys". United States. doi:10.1016/j.cossms.2018.12.001.
@article{osti_1542244,
title = {Chemically-biased diffusion and segregation impede void growth in irradiated Ni-Fe alloys},
author = {Barashev, Alexander V. and Osetsky, Yuri N. and Bei, Hongbin and Lu, Chenyang and Wang, Lumin and Zhang, Yanwen},
abstractNote = {Recent irradiations of Ni-Fe concentrated solid solution alloys have demonstrated significant improvement of radiation performance. This improvement is attributed to redistribution of the alloying elements near sinks of point defects (voids, dislocations) due to chemically-biased atomic diffusion, where vacancies have preference to migrate via Fe atoms and interstitials via Ni atoms. In Ni-Fe, all sinks are enriched by Ni atoms, which strongly affects further interactions of radiation-produced mobile defects with voids and dislocations, hence void growth and dislocation climb. Ni-decorated sinks interact stronger with interstitial atoms than vacancies, which enhances dislocation loops growth. At the same time, Ni segregation creates Fe-enriched “channels” for vacancy migration out of the damage region to agglomerate in the outer regions, inaccessible to interstitial atoms. Furthermore, strong effect of chemically-biased diffusion is supported by transmission electron microscope characterization and calls for special attention in designing alloys with desired properties through tuning defect mobilities.},
doi = {10.1016/j.cossms.2018.12.001},
journal = {Current Opinion in Solid State and Materials Science},
number = 2,
volume = 23,
place = {United States},
year = {2018},
month = {12}
}

Journal Article:
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This content will become publicly available on December 24, 2019
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