Microstructural Characterization of the Face-Centered Cubic-to-Hexagonal Close-Packed Transition in a Cobalt-Base Alloy and its Effect on Mechanical Strength

Microstructural Characterization of the Face-Centered Cubic-to-Hexagonal Close-Packed Transition... It is shown that the fcc-to-hcp transition in a Co-base alloy occurs by nucleation and growth during thermal aging as well as by stress-induced martensitic mechanism. The transition is promoted by relatively high concentrations of strong hcp-stabilizing elements particularly W and Cr, and relatively low concentration of fcc-stabilizing elements particularly Ni. Such a composition is shown to produce stacking fault energy of about 7 mJ/m2 in the fcc phase which is roughly equivalent to the free energy difference between the two phases and considered quite low in comparison with other Co-base alloys. Both the thermally induced and stress-induced transitions are shown to produce significant strengthening with substantial loss of ductility; however, the effect is more pronounced in the case of the stress-induced transition due to the formation of deformation twins in addition to the hcp phase. The results of the study can be of particular importance to designing Co-base alloys more stable toward the fcc-to-hcp transition. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Metallography, Microstructure, and Analysis Springer Journals

Microstructural Characterization of the Face-Centered Cubic-to-Hexagonal Close-Packed Transition in a Cobalt-Base Alloy and its Effect on Mechanical Strength

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature and ASM International
Subject
Materials Science; Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and Interfaces, Thin Films; Nanotechnology
ISSN
2192-9262
eISSN
2192-9270
D.O.I.
10.1007/s13632-018-0444-3
Publisher site
See Article on Publisher Site

Abstract

It is shown that the fcc-to-hcp transition in a Co-base alloy occurs by nucleation and growth during thermal aging as well as by stress-induced martensitic mechanism. The transition is promoted by relatively high concentrations of strong hcp-stabilizing elements particularly W and Cr, and relatively low concentration of fcc-stabilizing elements particularly Ni. Such a composition is shown to produce stacking fault energy of about 7 mJ/m2 in the fcc phase which is roughly equivalent to the free energy difference between the two phases and considered quite low in comparison with other Co-base alloys. Both the thermally induced and stress-induced transitions are shown to produce significant strengthening with substantial loss of ductility; however, the effect is more pronounced in the case of the stress-induced transition due to the formation of deformation twins in addition to the hcp phase. The results of the study can be of particular importance to designing Co-base alloys more stable toward the fcc-to-hcp transition.

Journal

Metallography, Microstructure, and AnalysisSpringer Journals

Published: Apr 18, 2018

References

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