Solidification microstructure maps in Ni-Al alloys
- Swiss Federal Inst. of Tech., Lausanne (Switzerland). Dept. of Materials
Laser surface resolidification experiments have been performed on Ni-Al alloys with 70--89 at.% Ni in the velocity range of 5 {center_dot} 10{sup {minus}4}--5 {center_dot} 10{sup {minus}1} m/s. Microstructures have been studied by optical and transmission electron microscopy. Growth of primary {gamma}-Ni, {beta}-NiAl and metastable {beta}-{gamma} eutectic occurred whereas no primary {gamma}{prime}-Ni{sub 3}Al was observed. A solidification microstructure selection map has been drawn, showing the coupled zone of metastable eutectic and the limit of plane front growth of {gamma}-Ni. The microstructure map has also been calculated on the basis of plane front, cellular/dendritic and eutectic growth models. There was a good agreement between experimental and calculated results, showing the potential of this approach for prediction of solidification microstructure.
- OSTI ID:
- 599695
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 12 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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