On the fcc to hcp transformation in a Co-Ru alloy: variant selection and intervariant boundary character
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
Ru is a common addition to the Co-binder in WCsingle bondCo hardmetals for advanced cutting tool applications. Internal Co-Co interfaces control many properties such as hot-hardness, toughness, and creep resistance. Hence, phase transformations determining the internal interface character can be harnessed to achieve superior properties. We investigate the γ (face-centred cubic) to α (hexagonally closed packed) martensitic phase transformation of a model Co-Ru binder alloy. We describe the crystallography of γ to α phase transformations and the resulting α/γ and α/α interface character distributions. The stabilisation of the γ-phase results in the formation of low energy (0 0 0 1) α/γ interphase boundary planes. Preferred formation of α/α intervariant and twin-related boundaries with symmetrical tilt configurations are also observed. We discuss how crystallographic constraints of the transformation promote the formation of grain boundary planes other than those of the lowest energy configurations.
Date Issued
2024-07-15
Date Acceptance
2024-04-11
Citation
Scripta Materialia, 2024, 248
ISSN
1359-6462
Publisher
Elsevier
Journal / Book Title
Scripta Materialia
Volume
248
Copyright Statement
© 2024 The Authors. Published by Elsevier Ltd on behalf of Acta Materialia Inc. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/).
(http://creativecommons.org/licenses/by/4.0/).
License URL
Identifier
http://dx.doi.org/10.1016/j.scriptamat.2024.116127
Publication Status
Published
Article Number
116127
Date Publish Online
2024-04-20