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Rapid solidification of Ni3Al by Osprey deposition

Published online by Cambridge University Press:  31 January 2011

D.G. Morris  and
M.A. Morris
D.G. Morris
Affiliation:
Institute of Structural Metallurgy, University of Neuchâtel, 2000 Neuchâtel, Switzerland
M.A. Morris
Affiliation:
Institute of Structural Metallurgy, University of Neuchâtel, 2000 Neuchâtel, Switzerland
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Abstract

A Ni3Al-based alloy containing Cr is examined after preparation by Osprey deposition. The microstructure consists of solidified spherical regions showing cellular segregation interspersed with regions of finer, equiaxed segregation morphology. The segregation structure is characterized by cell interiors rich in aluminum and poor in chromium, while the cell walls are poor in aluminum and rich in chromium. This segregation pattern is the inverse of that expected, based on earlier melt spinning experience, and is explained in terms of the undercooling of the melt prior to solidification. Very high temperature annealing is required to homogenize the material, despite the use of this rapid solidification process for material fabrication.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 2 , February 1991 , pp. 361 - 365
Copyright
Copyright © Materials Research Society 1991

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