About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing of Metals: Applications of Solidification Fundamentals
|
Presentation Title |
Solidification Microstructure in Invar-Cu Intrinsic Nanocomposites by Selective Laser Melting |
Author(s) |
Haobo Wang, Prosenjit Biswas, Ji Ma, Jerrold A. Floro |
On-Site Speaker (Planned) |
Haobo Wang |
Abstract Scope |
This research ultimately aims to develop thermally stable, precision reflector optics made from Invar-Cu alloys by laser powder bed fusion. The goal is to manipulate the solidification microstructure to obtain an appropriate composite microstructure that simultaneously provides low thermal expansion (based on Invar) and good thermal conductivity (based on Cu). Ideally, we seek to achieve an oriented Invar cellular matrix with a percolating intercellular Cu network that acts as thermal conduction channels throughout the build volume. In the initial research phase, the relationship between the laser scan parameters and the microstructure was studied by writing single melt tracks on arc-melted Invar-Cu boules. The resultant solidification microstructure and composition were characterized throughout melt-pool cross-sections. The deleterious effects of keyholing will be discussed. Microstructures will subsequently be connected to simulated thermal histories (temperature gradient & interface velocity) to construct a processing diagram. Support by the II-VI Foundation is gratefully acknowledged. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Solidification, Composites |