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The role of irradiation on deformation-induced martensitic phase transformations in face-centered cubic alloys

Published online by Cambridge University Press:  24 April 2020

Janelle P. Wharry*
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47905, USA
Keyou S. Mao
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA
*
a)Address all correspondence to this author. e-mail: jwharry@purdue.edu
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Abstract

Localized deformation, including that by the deformation-induced shearing martensitic phase transformation, is responsible for hardening and embrittlement in irradiated face-centered cubic alloys. These localized deformation processes can have profound consequences on the mechanical integrity of common structural metals used in extreme radiation environments such as nuclear reactors. This article aims to review and understand exactly how irradiation affects the martensitic phase transformation in face-centered cubic alloys, with an emphasis on austenitic stainless steel, given its ubiquity in the archival literature. The influence of irradiation on stacking fault energy and subsequent implications on the phase transformation are discussed. Mechanisms by which irradiation-induced microstructures enhance the phase transformation are also described, including the surface energy contribution of irradiation-induced cavities (i.e., voids and bubbles) toward the critical martensite nucleation energy, and partial dislocation–cavity interactions. A deformation mechanism map illustrates how irradiation-induced cavities can modulate the martensitic transformation pathway.

Type
Invited Feature Paper - Review
Copyright
Copyright © Materials Research Society 2020

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Footnotes

This paper has been selected as an Invited Feature Paper.

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