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Phase transformation strengthening of high-temperature superalloys

Decades of research has been focused on improving the high-temperature properties of nickel-based superalloys, an essential class of materials used in the hot section of jet turbine engines, allowing increased engine efficiency and reduced CO(2) emissions. Here we introduce a new ‘phase-transformati...

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Autores principales: Smith, T. M., Esser, B. D., Antolin, N., Carlsson, A., Williams, R. E. A., Wessman, A., Hanlon, T., Fraser, H. L., Windl, W., McComb, D. W., Mills, M. J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5121413/
https://www.ncbi.nlm.nih.gov/pubmed/27874007
http://dx.doi.org/10.1038/ncomms13434
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author Smith, T. M.
Esser, B. D.
Antolin, N.
Carlsson, A.
Williams, R. E. A.
Wessman, A.
Hanlon, T.
Fraser, H. L.
Windl, W.
McComb, D. W.
Mills, M. J.
author_facet Smith, T. M.
Esser, B. D.
Antolin, N.
Carlsson, A.
Williams, R. E. A.
Wessman, A.
Hanlon, T.
Fraser, H. L.
Windl, W.
McComb, D. W.
Mills, M. J.
author_sort Smith, T. M.
collection PubMed
description Decades of research has been focused on improving the high-temperature properties of nickel-based superalloys, an essential class of materials used in the hot section of jet turbine engines, allowing increased engine efficiency and reduced CO(2) emissions. Here we introduce a new ‘phase-transformation strengthening' mechanism that resists high-temperature creep deformation in nickel-based superalloys, where specific alloying elements inhibit the deleterious deformation mode of nanotwinning at temperatures above 700 °C. Ultra-high-resolution structure and composition analysis via scanning transmission electron microscopy, combined with density functional theory calculations, reveals that a superalloy with higher concentrations of the elements titanium, tantalum and niobium encourage a shear-induced solid-state transformation from the γ′ to η phase along stacking faults in γ′ precipitates, which would normally be the precursors of deformation twins. This nanoscale η phase creates a low-energy structure that inhibits thickening of stacking faults into twins, leading to significant improvement in creep properties.
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spelling pubmed-51214132016-12-02 Phase transformation strengthening of high-temperature superalloys Smith, T. M. Esser, B. D. Antolin, N. Carlsson, A. Williams, R. E. A. Wessman, A. Hanlon, T. Fraser, H. L. Windl, W. McComb, D. W. Mills, M. J. Nat Commun Article Decades of research has been focused on improving the high-temperature properties of nickel-based superalloys, an essential class of materials used in the hot section of jet turbine engines, allowing increased engine efficiency and reduced CO(2) emissions. Here we introduce a new ‘phase-transformation strengthening' mechanism that resists high-temperature creep deformation in nickel-based superalloys, where specific alloying elements inhibit the deleterious deformation mode of nanotwinning at temperatures above 700 °C. Ultra-high-resolution structure and composition analysis via scanning transmission electron microscopy, combined with density functional theory calculations, reveals that a superalloy with higher concentrations of the elements titanium, tantalum and niobium encourage a shear-induced solid-state transformation from the γ′ to η phase along stacking faults in γ′ precipitates, which would normally be the precursors of deformation twins. This nanoscale η phase creates a low-energy structure that inhibits thickening of stacking faults into twins, leading to significant improvement in creep properties. Nature Publishing Group 2016-11-22 /pmc/articles/PMC5121413/ /pubmed/27874007 http://dx.doi.org/10.1038/ncomms13434 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Smith, T. M.
Esser, B. D.
Antolin, N.
Carlsson, A.
Williams, R. E. A.
Wessman, A.
Hanlon, T.
Fraser, H. L.
Windl, W.
McComb, D. W.
Mills, M. J.
Phase transformation strengthening of high-temperature superalloys
title Phase transformation strengthening of high-temperature superalloys
title_full Phase transformation strengthening of high-temperature superalloys
title_fullStr Phase transformation strengthening of high-temperature superalloys
title_full_unstemmed Phase transformation strengthening of high-temperature superalloys
title_short Phase transformation strengthening of high-temperature superalloys
title_sort phase transformation strengthening of high-temperature superalloys
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5121413/
https://www.ncbi.nlm.nih.gov/pubmed/27874007
http://dx.doi.org/10.1038/ncomms13434
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