| Texto completo | |
| Autor(es): |
De Paula, Anderson Damasceno
;
De Gouveia, Guilherme Lisboa
;
Goncalves, Vinicius Richieri Manso
;
Afonso, Conrado Ramos Moreira
;
Silva, Bismarck Luiz
;
Sa, Jose Eduardo Spinelli Federal
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Alloys and Compounds; v. 1037, p. 16-pg., 2025-07-25. |
| Resumo | |
Al-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 degrees 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 hyper-eutectic 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. (AU) | |
| Processo FAPESP: | 23/06107-3 - Estudo do crescimento de fases primárias AlFe em ligas de Al e de camadas intermetálicas em juntas Sn-Bi-X/cobre |
| Beneficiário: | José Eduardo Spinelli |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 24/03615-0 - Avaliação da morfologia, modo de crescimento e propriedades dos intermetálicos CuSn e AlFe por meio de técnicas avançadas de caracterização |
| Beneficiário: | Guilherme Lisboa de Gouveia |
| Modalidade de apoio: | Bolsas no Brasil - Programa Capacitação - Treinamento Técnico |
| Processo FAPESP: | 24/00306-7 - Manufatura aditiva a laser de liga Beta Ti-Nb e de compósitos reforçados com TiC visando a aplicação biomédica |
| Beneficiário: | Vinícius Richieri Manso Gonçalves |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 23/16836-2 - Plataforma Multiusuário para obtenção de Pós através de Atomização Ultrasônica e Impressão 3D de Ligas de Titânio, multiprincipais e refratárias para Aplicações Biomédicas e Avançadas |
| Beneficiário: | Conrado Ramos Moreira Afonso |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Infraestrutura - Pequeno Médio Porte |