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Unusual irradiation-induced disordering in Cu3Au near the critical temperature: An in situ study using electron diffraction

Published online by Cambridge University Press:  20 September 2018

Calvin Robert Lear ,
Robert S. Averback ,
Pascal Bellon ,
Andrea E. Sand  and
Marquis A. Kirk
Calvin Robert Lear*
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Robert S. Averback
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Pascal Bellon
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
Andrea E. Sand
Affiliation:
Department of Physics, University of Helsinki, Helsinki FI-00014, Finland
Marquis A. Kirk
Affiliation:
Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
*
a)Address all correspondence to this author. e-mail: crlear2@illinois.edu
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Abstract

Atomic mixing by replacement collision sequences and other cascade effects is well known to create chemical disorder in irradiated alloys. Most studies of irradiation-induced disordering have focused on ex situ analysis of irradiated samples; however, fast in situ techniques are necessary to measure disordering at elevated temperatures without significant interference from concurrent re-ordering processes. In the present work, we use in situ electron diffraction with high speed data collection to measure the initial change in the long-range order parameter S with ion dose ϕ during 500 keV Ne+ irradiation of Cu3Au foils. The data reveal an unexpected and dramatic increase in the disordering rate as the critical order–disorder transition temperature TC is approached. Molecular dynamics simulations show that this increase is not due to temperature-dependent cascade mixing. We attribute the enhanced disordering, instead, to coupling between point defect fluxes and the chemical state of order.

Keywords

radiation effectsdefectstransmission electron microscopy (TEM)
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 22 , 28 November 2018 , pp. 3841 - 3848
Copyright
Copyright © Materials Research Society 2018 

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