Unveiling the impact of Cr on the solidification and mechanical properties of heat-resistant Al-13 %Ce alloy

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dc.contributor.authorPaula, Anderson Damasceno de
dc.contributor.authorGouveia, Guilherme Lisboa de
dc.contributor.authorGonçalves, Vinícius Richieri Manso
dc.contributor.authorAfonso, Conrado Ramos Moreira
dc.contributor.authorSilva, Bismarck Luiz
dc.contributor.authorSpinelli, José Eduardo
dc.contributor.authorIDhttps://orcid.org/0009-0007-9338-4566
dc.contributor.authorIDhttps://orcid.org/0000-0001-6887-4976
dc.contributor.authorIDhttps://orcid.org/0000-0002-3464-9217
dc.contributor.authorIDhttps://orcid.org/0000-0001-7505-8467
dc.contributor.authorIDhttps://orcid.org/0000-0001-7191-1942
dc.contributor.authorIDhttps://orcid.org/0000-0003-0611-1038
dc.date.accessioned2025-11-03T21:48:05Z
dc.date.available2025-11-03T21:48:05Z
dc.date.issued2025
dc.description.resumoAl-Ce alloys have attracted significant attention as promising materials for both casting and heat-resistant parts. To improve microstructural stability one strategy is the addition of elements with low solubility in Al as well as low diffusivity at 300–400 °C. Cr emerges as a particularly promising candidate to improve stability. Understanding the combined effects of third-element additions and cooling rates during solidification is essential to improve microstructure and mechanical performance of Al-Ce-Cr alloys. This study investigates the influence of Cr (Al-10wt%Ce-1wt%Cr) and cooling rates on the microstructure and compressive load behavior of a hypereutectic Al-13wt%Ce binary alloy, produced using a non-steady-state directional solidification technique. Cr additions lead to increased secondary dendritic spacing and Al+Al11Ce3 eutectic spacing at the same solidification velocity. This is mostly attributed to the strong melt convection generated by the primary Cr-containing intermetallic particles during upward solidification of the Al-10wt%Ce-1wt%Cr ternary alloy. The microstructure of the binary Al-Ce alloy is constituted by the eutectic constituent, whereas the ternary alloy solidified both Al20CeCr2 primary particles and the eutectic. Compressive strength and microhardness have been correlated with cooling rate; however, the resulated related to the binary alloy does not show a dependence on cooling rate (i.e., on microstructural coarsening). Despite coarser primary particles in higher fractions for Al-Ce-Cr samples at lower cooling rates of 0.76 K/s, they exhibited lower compressive strength as compared with samples at higher cooling rates of 15.9 K/s. This behavior is attributed to the more refined primary particles due to higher cooling rates that may provide a higher density of dislocation obstacles and reduced fragmentation and microcracking during compressive loading
dc.identifier.citationPAULA, Anderson Damasceno de; GOUVEIA, Guilherme Lisboa de; GONÇALVES, Vinícius Richieri Manso; AFONSO, Conrado Ramos Moreira; SILVA, Bismarck Luiz; SPINELLI, José Eduardo. Unveiling the impact of Cr on the solidification and mechanical properties of heat-resistant Al-13 %Ce alloy. Journal of Alloys and Compounds, [S.L.], v. 1037, p. 182476, ago. 2025. Elsevier BV. DOI: http://dx.doi.org/10.1016/j.jallcom.2025.182476. Disponível em: https://www.sciencedirect.com/science/article/pii/S092583882504037X?via%3Dihub. Acesso em: 14 out. 2025.
dc.identifier.doihttps://doi.org/10.1016/j.jallcom.2025.182476.
dc.identifier.urihttps://repositorio.ufrn.br/handle/123456789/65990
dc.language.isoen
dc.publisherJournal of Alloys and Compounds
dc.subjectAl-Ce
dc.subjectAl-Ce-Cr
dc.subjectSolidification
dc.subjectCALPHAD
dc.subjectKinetics
dc.subjectCompressive strength
dc.titleUnveiling the impact of Cr on the solidification and mechanical properties of heat-resistant Al-13 %Ce alloy
dc.typearticle

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