About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Lightweight Composites, Materials, and Alloys
|
| Presentation Title |
Microstructure-Controlled Transition from Recovery to Recrystallization in Cast and Semisolid Processed A356 Alloy |
| Author(s) |
Gangarapu Akhila, Sree Harsha Nandam, Srihari Dodla |
| On-Site Speaker (Planned) |
Gangarapu Akhila |
| Abstract Scope |
The hot deformation behavior of A356 aluminum alloy in cast and semisolid processed (SSP) conditions was investigated to elucidate the role of eutectic Si morphology on deformation mechanisms and softening response. Isothermal compression tests were performed over 250-450°C and strain rates of 0.001-1 s⁻¹. The deformation behavior was analyzed through true stress–strain curves and post-deformation microstructures using optical and scanning electron microscopy. The SSP alloy consistently exhibited higher flow stresses than the cast alloy due to its refined and homogeneous microstructure. In the cast alloy, an interconnected acicular Si network persists during deformation, restricting dislocation motion and limiting recrystallization. In contrast, the SSP alloy contains uniformly distributed spheroidized Si particles that promote homogeneous deformation and facilitate dislocation rearrangement. At elevated temperatures and lower strain rates, the SSP alloy shows pronounced softening associated with dynamic recovery and continuous dynamic recrystallization, highlighting the critical role of second-phase morphology in controlling deformation behavior. |