Modeling thermal spike driven reactions at low temperature and application to zirconium carbide radiation damage

Ulmer, Christopher J.; Motta, Arthur T.

doi:10.1016/j.nimb.2017.08.015

Modeling thermal spike driven reactions at low temperature and application to zirconium carbide radiation damage

Journal Article · Fri Sep 01 00:00:00 EDT 2017 · Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms

DOI:https://doi.org/10.1016/j.nimb.2017.08.015· OSTI ID:1538667

Ulmer, Christopher J. ^[1]; Motta, Arthur T. ^[2]

Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical and Nuclear Engineering; DOE/OSTI
Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical and Nuclear Engineering

The development of TEM-visible damage in materials under irradiation at cryogenic temperatures cannot be explained using classical rate theory modeling with thermally activated reactions since at low temperatures thermal reaction rates are too low. Although point defect mobility approaches zero at low temperature, the thermal spikes induced by displacement cascades enable some atom mobility as it cools. In this work a model is developed to calculate “athermal” reaction rates from the atomic mobility within the irradiation-induced thermal spikes, including both displacement cascades and electronic stopping. The athermal reaction rates are added to a simple rate theory cluster dynamics model to allow for the simulation of microstructure evolution during irradiation at cryogenic temperatures. The rate theory model is applied to in-situ irradiation of ZrC and compares well at cryogenic temperatures. The results show that the addition of the thermal spike model makes it possible to rationalize microstructure evolution in the low temperature regime.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)

Grant/Contract Number:: NE0000639

OSTI ID:: 1538667

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms, Journal Name: Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms Vol. 410; ISSN 0168-583X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
athermal
ion irradiation
rate theory
thermal spike
zirconium carbide

Modeling thermal spike driven reactions at low temperature and application to zirconium carbide radiation damage

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References (14)

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