|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Application of Solidification Fundamentals to Challenges in Metal Additive Manufacturing
||Microstructure Formation in Rapid Solidification of Electron-beam Melted Ni-Sn Alloys
||Rijie Zhao, Jianrong Gao, Jerry Guo, Brant Wu
|On-Site Speaker (Planned)
Additive manufacturing involves rapid solidification of millimeter-sized pools at high cooling rates. An understanding of microstructure formation in such a rapid solidification process is of vital importance to improvement of mechanical properties of additively manufactured products. Ni-Sn alloys of near-eutectic composition can be an ideal model material for studies of microstructure formation in additive manufacturing because they crystallize into a variety of metastable microstructure under high undercooling conditions. In the present work, arc-melted ingots of near-eutectic Ni-Sn composition were remelted using electron beams at different power intensity. The microstructure of the samples were investigated. A banded microstructure was observed and interpreted by considering competitive growth of different morphologies in rapid solidification. The magnitude of melt undercooling achieved by electron beam melting was estimated by comparing the microstructure of the present samples with those of undercooled bulk samples of similar composition.
||Planned: Supplemental Proceedings volume