Microstructure and mechanical properties of rapidly solidified and annealed Ni-Al intermetallic alloys

Research output: Contribution to journalArticle

Abstract

A series of rapidly solidified Ni-Al intermetallic alloys containing a nickel concentration in the range 61.3-76 at.% have been produced by the hammer and anvil technique. Electron metallography ductility and hardness measurements have been carried out to characterize the microstructure and mechanical properties of these alloys in both quenched and 1000°C annealed conditions. Rapid solidification, which has little effect on the composition at which γ(Ni3Al) first forms, shifts the composition at which β(NiAl) terminates towards a higher nickel content. The observed microstructures suggest the existence of a metastable β + α(Ni) eutectic and the accompanied suppression of the peritectic reaction by which γ(Ni3Al) forms. The γ(Ni3Al) phase is believed to form through ordering of the supersaturated α(Ni). Annealing at 1000°C produces phases the stability ranges of which are consistent with the equilibrium phase diagram. A ductility maxima of 2% observed at 65 at.% Ni, in both as quenched and annealed alloys, is neither related to strain induced martensitic transformation of β phase nor the existence of α/β interphase boundaries.

Original languageEnglish (US)
Pages (from-to)1573-1583
Number of pages11
JournalActa Metallurgica
Volume37
Issue number6
DOIs
StatePublished - 1989

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Intermetallics
Nickel
Mechanical properties
Microstructure
Ductility
Rapid solidification
Metallography
Hammers
Martensitic transformations
Chemical analysis
Eutectics
Phase diagrams
Hardness
Annealing
Electrons

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Microstructure and mechanical properties of rapidly solidified and annealed Ni-Al intermetallic alloys. / Nourbakhsh, Said; Chen, P.

In: Acta Metallurgica, Vol. 37, No. 6, 1989, p. 1573-1583.

Research output: Contribution to journalArticle

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