Equilibria involving P- and (σ-phases in Ni–Cr–Al–Mo system
1986; Maney Publishing; Volume: 2; Issue: 2 Linguagem: Inglês
10.1179/mst.1986.2.2.110
ISSN1743-2847
AutoresS. Chakravorty, S. Sadiq, D. R. F. West,
Tópico(s)Advanced materials and composites
ResumoAbstractAbstractAn investigation is reported of phase equilibria in alloys of the Ni–Cr–AI–Mo system containing 60 and 50 at. –%Ni annealed at 1523 K. The experimental methods used mainly were electron microscopy, electron probe microanalysis, and X–ray diffraction. Four quaternary alloys were used, with compositions (at.–%) lying on a line between Ni60Al40 and Ni60Cr20Mo20,and one alloy containing 50Ni–28Cr–10AI-12Mo.The composition range was chosen to include the P–and σ –phases based on the Ni–Cr–Mo system. The phases involved in equilibria at 1523 K in the 60 at. –%Ni alloy series were γ (Ni–base solid solution), β (based on NiAI), Mo–base solid solution, and P; the 50 at. –%Ni alloy contained γ, β and σ. Partial isothermal sections of the quaternary system at 60 and 50 at. –%Ni have been determined. Eutectics containing either γ + P or γ + β + P were presentin the as–solidified 60 at. –%Ni alloys, while a γ + β + σ eutectic was present in the 50 at–%Ni alloy; some compositional data for eutectic phases were obtained by analytical transmission electron microscopy. High hardness values (from ~ 500 to 670 HV) were obtained in the as–solidified alloys.MST/265
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