Characterization of Hypereutectic Al-Si Powders Solidified under Far-From Equilibrium Conditions
Journal Article
·
· The Minerals, Metals & Materials Society
The rapid solidification microstructure of gas-atomized Al-Si powders of 15, 18, 25, and 50 wt pct Si were examined using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). In order of increasing particle size, the powders exhibited microcellular Al, cellular/dendritic Al, eutectic Al, and primary Si growth morphologies. Interface velocity and undercooling were estimated from measured eutectic spacing based on the Trivedi-Magnin-Kurz (TMK) model, permitting a direct comparison with theoretical predictions of solidification morphology. Based on our observations, additional conditions for high-undercooling morphological transitions are proposed as an extension of coupled-zone predictions.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA
- Sponsoring Organization:
- USDOE - Office of Science (SC)
- DOE Contract Number:
- AC02-07CH11358
- OSTI ID:
- 912689
- Report Number(s):
- IS-J 7126
- Journal Information:
- The Minerals, Metals & Materials Society, Journal Name: The Minerals, Metals & Materials Society Vol. 38A; ISSN 1073-5623
- Country of Publication:
- United States
- Language:
- English
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