Unveiling the impact of Cr on the solidification and mechanical properties of heat-resistant Al-13 %Ce alloy
| Author | Paula, Anderson Damasceno de; Gouveia, Guilherme Lisboa de; Gonçalves, Vinícius Richieri Manso; Afonso, Conrado Ramos Moreira; Silva, Bismarck Luiz; Spinelli, José Eduardo | |
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| Publisher | Journal of Alloys and Compounds | |
| Date | 2025 | |
| Keywords | Al-Ce Al-Ce-Cr Solidification CALPHAD Kinetics Compressive strength | |
| Citation | ||
| Abstract | 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 °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 | |
| URI | https://repositorio.ufrn.br/handle/123456789/65990 | |
| Collections | CT - DEMAT - Artigos publicados em periódicos |
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