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Microstructure of atomized Ni3Al–B powder

Published online by Cambridge University Press:  31 January 2011

S. C. Huang and
A. M. Ritter
S. C. Huang
Affiliation:
General Electric Corporate Research and Development, P.O. Box 8, Scheneclady, New York 12301
A. M. Ritter
Affiliation:
General Electric Corporate Research and Development, P.O. Box 8, Scheneclady, New York 12301
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Abstract

The microstructure of boron-doped Ni3Al powder has been characterized by optical and transmission electron microscopy. Remarkable variations in the solidification morphology and phase reaction were observed as a function of powder size. The degree of boron segregation appeared to be reduced significantly, as the formation of M23B6 boride was suppressed in powder below ∼30 μm diameter. The primary solidification phase was disordered γ–Ni, which underwent a solid-state ordering transition to produce fine γ′–Ni3Al antiphase domains. A bi-modal distribution of domain sizes was observed due to Al segregation. The solidification morphology was dendritic for particles above ∼20 μm, and it changed to cellular below. In powder less than 40 μm diameter, second-phase particles of β–NiAl were found in intergranular regions, likely due to a metastable eutectic reaction of L ⇉ γ + β. The β phase was suppressed only for powder sizes below ∼2 μm. Judging from the tendency of second-phase formation, the Ni3Al–B powder appeared to cool slower than arc-hammer foil and melt-spun ribbon.

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Articles
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Journal of Materials Research , Volume 4 , Issue 2 , April 1989, pp. 288 - 293
Copyright
Copyright © Materials Research Society 1989

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