About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
|
Presentation Title |
Using rapid thermal treatment of oriented microstructures
to enable fine-resolution additive manufacturing |
Author(s) |
Sathyanarayan Sairam Jaishankar, Donggang Yao, Jack Gongyao Zhou, Jie Xu |
On-Site Speaker (Planned) |
Sathyanarayan Sairam Jaishankar |
Abstract Scope |
The high surface tension and low viscosity of molten metals prevent stable extrudate formation necessary for continuous extrusion. However, semi-solid alloys may demonstrate thixotropic effects, enabling their use in extrusion-based processes such as fused deposition modeling (FDM). The thixotropic microstructure in semi-solid alloys consists of globular solid grains suspended in a liquid matrix. Previous attempts to 3D print objects with rheocasters resulted in poor print resolution and nozzle clogging due to large globular grains (>50um). In this work, we demonstrate that the orientation of phases in the initial microstructure can promote instability effects during rapid heat treatment, resulting in small globular grains (<10um). CALPHAD simulations are employed to select suitable alloy compositions for processing. The globularization mechanism is elucidated with backscattered SEM images of quenched microstructures. The trends in globularization time and initial globular grain size with respect to the set temperature of the heating medium are analyzed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Characterization, Phase Transformations |