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dc.contributor.author
Ma, Kan
dc.contributor.author
Blackburn, Thomas
dc.contributor.author
Magnussen, Johan P.
dc.contributor.author
Kerbstadt, Michael
dc.contributor.author
Ferreirós, Pedro Antonio
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dc.contributor.author
Pinomaa, Tatu
dc.contributor.author
Hofer, Christina
dc.contributor.author
Hopkinson, David G.
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Day, Sarah J.
dc.contributor.author
Bagot, Paul A.J.
dc.contributor.author
Moody, Michael P.
dc.contributor.author
Galetz, Mathias C.
dc.contributor.author
Knowles, Alexander J.
dc.date.available
2024-01-29T15:16:25Z
dc.date.issued
2023-09
dc.identifier.citation
Ma, Kan; Blackburn, Thomas; Magnussen, Johan P.; Kerbstadt, Michael; Ferreirós, Pedro Antonio; et al.; Chromium-based bcc-superalloys strengthened by iron supplements; Pergamon-Elsevier Science Ltd; Acta Materialia; 257; 9-2023; 1-16
dc.identifier.issn
1359-6454
dc.identifier.uri
http://hdl.handle.net/11336/225101
dc.description.abstract
Chromium alloys are being considered for next-generation concentrated solar power applications operating > 800 °C. Cr offers advantages in melting point, cost, and oxidation resistance. However, improvements in mechanical performance are needed. Here, Cr-based body-centred-cubic (bcc) alloys of the type Cr(Fe)-NiAl are investigated, leading to ‘bcc-superalloys’ comprising a bcc-Cr(Fe) matrix (β) strengthened by ordered-bcc NiAl intermetallic precipitates (β’), with iron additions to tailor the precipitate volume fraction and mechanical properties at high temperatures. Computational design using CALculation of PHAse Diagram (CALPHAD) predicts that Fe increases the solubility of Ni and Al, increasing precipitate volume fraction, which is validated experimentally. Nano-scale, highly-coherent B2-NiAl precipitates with lattice misfit ∼ 0.1% are formed in the Cr(Fe) matrix. The Cr(Fe)-NiAl A2-B2 alloys show remarkably low coarsening rate (∼102 nm3/h at 1000 °C), outperforming ferritic-superalloys, cobalt- and nickel-based superalloys. Low interfacial energies of ∼ 40/20 mJ/m2 at 1000/1200 °C are determined based on the coarsening kinetics. The low coarsening rates are principally attributed to the low solubility of Ni and Al in the Cr matrix. The alloys show high compressive yield strength of ∼320 MPa at 1000 °C. The Fe-modified alloy exhibits resistance to age softening, related to the low coarsening rate as well as the relatively stable Orowan strengthening as a function of precipitate radius. Microstructure tailoring with Fe additions offers a new design route to improve the balance of properties in “Cr-superalloys”, accelerating their development as a new class of high-temperature materials.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
BCC-SUPERALLOY
dc.subject
CHROMIUM
dc.subject
COARSENING KINETICS
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ELECTRON MICROSCOPY
dc.subject
STRENGTHENING
dc.subject.classification
Ingeniería de los Materiales
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dc.subject.classification
Ingeniería de los Materiales
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dc.subject.classification
INGENIERÍAS Y TECNOLOGÍAS
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dc.title
Chromium-based bcc-superalloys strengthened by iron supplements
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2024-01-29T13:07:27Z
dc.journal.volume
257
dc.journal.pagination
1-16
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Ma, Kan. University Of Birmingham;
dc.description.fil
Fil: Blackburn, Thomas. University Of Birmingham;
dc.description.fil
Fil: Magnussen, Johan P.. University Of Birmingham;
dc.description.fil
Fil: Kerbstadt, Michael. No especifíca;
dc.description.fil
Fil: Ferreirós, Pedro Antonio. University Of Birmingham; . Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Pinomaa, Tatu. No especifíca;
dc.description.fil
Fil: Hofer, Christina. University of Oxford; Reino Unido
dc.description.fil
Fil: Hopkinson, David G.. No especifíca;
dc.description.fil
Fil: Day, Sarah J.. No especifíca;
dc.description.fil
Fil: Bagot, Paul A.J.. University of Oxford; Reino Unido
dc.description.fil
Fil: Moody, Michael P.. University of Oxford; Reino Unido
dc.description.fil
Fil: Galetz, Mathias C.. No especifíca;
dc.description.fil
Fil: Knowles, Alexander J.. University Of Birmingham;
dc.journal.title
Acta Materialia
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.actamat.2023.119183
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