| Texto completo | |
| Autor(es): |
Xavier, Marcella G. C.
;
Reyes, Rodrigo A., V
;
Gomes, Leonardo F.
;
Spinelli, Jose E.
;
Mangelinck-Noel, N.
;
Nguyen-Thi, Henri
;
Reinhart, Guillaume
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Crystal Growth; v. 536, p. 10-pg., 2020-04-15. |
| Resumo | |
Al-based monotectic alloys show an interesting combination of wear resistance and mechanical strength. While self-lubricating bismuth (Bi) guarantees an adequate wear resistance, the modification with copper (Cu) can increase the ability to support load. Tailoring the micromorphology of the alpha-Al phase as well as the distribution of the inclusions of Bi embedded in the alpha-Al matrix is of prime importance in order to improve the properties. In this paper, various solidification experiments are performed with the Al-3.2wt.%Bi-3wt.%Cu monotectic alloy. Real-time radiographs could be acquired during solidification by using the laboratory device SFINX (Solidification Furnace with IN situ X-radiography). The processing conditions could be chosen in such a way that both cellular and dendritic morphologies of the alpha-Al phase could be clearly seen in a single test. Micromorphological transitions from dendrites to cells are recognized for samples solidified from different cooling rates, i.e. 0.025 K/s and 0.01 K/s. Measurements of the alpha-Al dendrite velocity and growth parameters of the Bi droplets during solidification have also been extensively performed. A comprehensive model for the cellular-to-dendritic (CDT) transition of Al-based monotectic alloys is outlined. The model considers the interaction between alpha-Al and Bi droplets during solidification and its impact on the microstructure. (AU) | |
| Processo FAPESP: | 17/12741-6 - Aplicação de técnicas experimentais de solidificação, caracterização microestrutural e de propriedades na avaliação de ligas eutéticas e hipereutéticas à base de Al e Zn |
| Beneficiário: | José Eduardo Spinelli |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |