Microstructure and stability of rapidly solidified Al-Mn-Ni alloys

Dasgupta, R.; Bose, Surajit

doi:10.1007/bf00277091

Cited by 2 publications

(1 citation statement)

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“…Microstructure and stability of rapidly solidified Al-Mn-Ni alloys have been studied. 20 Electron channelling enhanced microanalysis on Ni-Al-Mn alloys has been treated. 21 When studying Ni-Al-Mn system the authors have been mainly interested in phases and microstructures originating during the diffusion anneal (900uC, 4 h) of a couple consisting of NiAl (having a higher 79 wt-%Ni5 63 .…”

Section: Introductionmentioning

confidence: 99%

Manganese enriched diffusion layers on NiAl alloy

Bartuška¹,

Lašek²,

Paidar³

2006

Surface Engineering

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Materials based on Ni-Al intermetallics are prospective high temperature materials. Properties of these intermetallics can often be improved by surface diffusion layers enriched by various metals. In this contribution results of a study are presented about microstructure and composition of Mn enriched diffusion layers on a NiAl alloy.A pure Mn plate was annealed at 900uC for 4 h in contact with a prism of the NiAl phase. The ordered B2-NiAl (b9) phase can absorb only a few per cent of manganese without structural changes. When absorbing more Mn, the ordrerd B2-NiAl phase transforms into the disordered bcc b0 NiMnAl phase forming the first structurally different (narrow) layer on NiAl. Its Mn content increases from 25 wt-% (in contact with B2-NiAl phase) up to 35 wt-% across this homogeneous layer. Higher average Mn content in the next layer manifests in precipitation of b-Mn particles (containing several per cent of Ni and Al) from the b0 matrix. Owing to diffusion of Ni and Al into the original Mn plate the b0 NiMnAl precipitates are formed in the Mn matrix containing several per cent of Ni and Al (when studying microstructure and composition at room temperature after annealing).

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Section: Introductionmentioning

confidence: 99%