| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Cast Shop Technology
|
| Presentation Title |
Stability of SiC and Al2O3 Reinforcement Particles in Thermomechanical Processed Direct Chill Cast 6xxx Al MMnCs |
| Author(s) |
Abdallah Abu Amara, Guangyu Liu, Dmitry Eskin, Brian McKay |
| On-Site Speaker (Planned) |
Abdallah Abu Amara |
| Abstract Scope |
Aluminium alloys reinforced by alumina (Al2O3) and silicon carbide (SiC) were investigated. Lab-scale DC cast billets with a diameter of 80 mm were cast by ultrasound-assisted stir-casting technology. The billets were subsequently thermo-mechanically processed. The distribution of particles in the matrix was analysed before and after thermomechanical processing. Hot rolling improved the distribution of reinforcement particles in the matrix. Reactions between the reinforcement particles and the matrix were investigated, and their implications studied. Alumina reinforcement reacted with magnesium (Mg) in the alloy to produce spinel and SiC oxidised producing a layer of silicon oxide (SiO2) around the particles. The consequences of these reactions are discussed. Whilst theoretical calculations of free energies for different carbides suggested that transition metals in the alloys should substitute the silicon in SiC, no reactions were observed in the physical experimentation, due to the weight percentages of the transition metals in the alloy being too small. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, Composites, |