Effect of refractory elements on the evolution of the NiAl intermetallic phase in NiCrAl alloys

González-Carrasco, José Luis; Adeva, P.; Aballe, M.

doi:10.1016/0921-5093(90)90231-q

Cited by 9 publications

(2 citation statements)

References 13 publications

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“…Moreover, the presence of a precipitates, not expected in the aforementioned isothermal section, proves that the two materials have not attained the equilibrium state after 2 h at 1250 8C. Longer times to attain complete equilibrium by diffusion in Ni 3 Al-based alloys have been observed by different authors [17], and have been associated with low diffusivity in the ordered g 0 phase lattice. The inhomogeneous distribution of Al 2 O 3 particles and the Cr reinforcement, located preferentially in fine grain areas, may explain the microstructural differences between the two areas and the two materials.…”

Section: Microstructurementioning

confidence: 94%

Microstructure and mechanical properties of Ni3Al base alloy reinforced with Cr particles produced by powder metallurgy

et al. 2006

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Section: Microstructurementioning

confidence: 94%

Microstructure and mechanical properties of Ni3Al base alloy reinforced with Cr particles produced by powder metallurgy

et al. 2006

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“…The g 0 -Ni 3 Al matrix, which contains 8 at.% of chromium in the RS powders, also rejects Cr by the precipitation of Cr-rich particles. The precipitation of Cr-rich particles in g 0 -Ni 3 Al regions or in regions originally occupied by b-phase was also observed in thermally treated cast NieAleCr alloys [7] and in PM Ni 3 AleCr alloys [3].…”

Section: Discussionmentioning

confidence: 87%

Precipitation of Cr-rich phases in rapidly solidified Ni–20Al–8Cr (at.%) powders

et al. 2007

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The evolution of the microstructure in rapidly solidified Nie20.9Ale8Cre0.49B (at.%) powders after different continuous and isothermal heat treatments at temperatures up to 1100 C has been studied by electron microscopy and microanalysis. Powders in the rapidly solidified condition have a dendritic microstructure consisting of Ni 3 Al dendrites and a NiAl phase in the interdendritic regions. Chromium is in solid solution in both phases. This microstructure is stable when heating at 10 K min À1 up to 750 C. When the powders are heated up to 950 C, partial dissolution of the NiAl phase and the precipitation of very small chromium-rich particles take place.The microstructure of the powders after annealing at temperatures between 750 and 1100 C for different times is characterised by the dissolution of the b-NiAl phase and the simultaneous precipitation of various Cr-rich phases. a-Chromium, the metastable X-phase, and dark polygonal Cr 5 B 3 precipitates have been identified.The segregation of chromium and boron in the form of borides removes these elements from the intermetallic matrix, so the content of both elements should be optimised to preserve their beneficial influence on the ductility of the g 0 -Ni 3 Al phase.

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Laser-surface-alloying of the iron based superalloy Incoloy-800H with Al

Gutierrez¹,

Damborenea²

1996

Appl. Phys. A

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Effect of refractory elements on the evolution of the NiAl intermetallic phase in NiCrAl alloys

Cited by 9 publications

References 13 publications

Microstructure and mechanical properties of Ni3Al base alloy reinforced with Cr particles produced by powder metallurgy

Microstructure and mechanical properties of Ni3Al base alloy reinforced with Cr particles produced by powder metallurgy

Precipitation of Cr-rich phases in rapidly solidified Ni–20Al–8Cr (at.%) powders

Laser-surface-alloying of the iron based superalloy Incoloy-800H with Al

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