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

Barashev, Alexander V.; Osetsky, Yuri N.; Bei, Hongbin; Lu, Chenyang; Wang, Lumin; Zhang, Yanwen

doi:10.1016/j.cossms.2018.12.001

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

Journal Article · Mon Dec 24 00:00:00 EST 2018 · Current Opinion in Solid State and Materials Science

DOI:https://doi.org/10.1016/j.cossms.2018.12.001· OSTI ID:1542244

Barashev, Alexander V. ^[1];

^[2];

^[2]; Lu, Chenyang ^[1]; Wang, Lumin ^[1];

^[2]

Univ. of Michigan, Ann Arbor, MI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1542244

Alternate ID(s):: OSTI ID: 1637016

Journal Information:: Current Opinion in Solid State and Materials Science, Vol. 23, Issue 2; ISSN 1359-0286

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 22 works

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