| Titre : | Influence of Rotational Speed on the Fabrication, Characterization, and Numerical Modeling of a Centrifugally Cast Al-Si/SiC Functionally Graded Material |
| Auteurs : | Amina Djoudi, Auteur ; Ibtihal Temmar, Auteur |
| Type de document : | texte imprimé |
| Année de publication : | 2026 |
| Format : | 1 fichier PDF / ill. |
| Langues : | Français |
| Tags : | functionally graded materials ; Al–Si/SiC composites ; vertical centrifugal casting ; rotational speed ; microhardness gradient ; tensile properties ; COMSOL Multiphysics ; grading laws. |
| Résumé : |
This thesis studies the fabrication, characterization, and numerical modeling of centrifugally cast Al–Si/SiC functionally graded composites with a focus on the influence of rotational speed on the properties. Three specimens were produced at 800, 1000, and 1200 rpm with 2 wt% SiC reinforcement in a recycled automotive-piston Al–Si matrix. Mechanical characterisation
showed that the 1200 rpm specimen achieved the highest tensile strength (191.4 MPa) and the steepest radial hardness gradient (rim-to-core differential ≈80 HV), while the 1000 rpm specimen displayed anomalously uniform properties, confirmed along two independent diame-tral scans. Optical micrography showed SiC particles visually more concentrated near the core than the rim in the more strongly graded specimens, contrary to classical centrifugal-segregation expectations and tentatively attributed to inward displacement by the advancing solidification front. Finite element simulations in COMSOL Multiphysics using linear, power, and exponen-tial grading laws reproduced the experimental elastic response with high correlation across all configurations tested (R2 > 0.93); among these, the linear law at α = 1 was the uniquely consis-tent configuration, its area-weighted average modulus matching the experimentally calibrated homogeneous baseline exactly (R2 = 0.9987), while the power and exponential laws systemati-cally overestimated the elastic slope due to the high area-weighted SiC surface modulus. |
Exemplaires
| Code-barres | Cote | Support | Localisation | Section | Disponibilité | ||||
|---|---|---|---|---|---|---|---|---|---|
| aucun exemplaire |
