Formation of aluminides on Ni-based superalloy 690 substrate, their characterization and first-principle Ni(111)/NiAl(110) interface simulations

Dutta, R.S.; Arya, A.; Yusufali, C.; Vishwanadh, B.; Tewari, R.; Dey, G.K.

doi:10.1016/j.surfcoat.2013.08.061

Cited by 19 publications

(2 citation statements)

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“…These characteristics make AlNi a potential candidate to be applied as a hightemperature protective coating. Different techniques are used to promote the formation of an AlNi layer over the surface of superalloys [11,13,14]. One of the manufacturing processes suitable to generate the coating is pack cementation [15], where the superalloy is held at high temperature in contact with an Al containing mixture to promote the formation of the AlNi phase by diffusion.…”

Section: Introductionmentioning

confidence: 99%

“…The existing studies about aluminide coatings are mainly focused on their microstructures, mechanical properties and oxidation behavior [10,11,13,14,51], but limited information is available regarding the AlNi formation kinetics and solid state transformations when it grows from Ni-based substrates exposed to Al-rich media at elevated temperatures. In such cases, the AlNi intermetallic constitutes the main phase in the diffusion coating, and it is thus necessary to study the evolution of its formation as function of time and temperature.…”

Section: Introductionmentioning

confidence: 99%

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TEM and Synchrotron X-ray Study of the Evolution of Phases Formed During Bonding of IN718/Al/IN718 Couples by TLPB

Poliserpi

Barriobero-Vila

Requena

et al. 2021

Metall Mater Trans A

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This study investigates the microstructure across the interconnection zone of an IN718/Al/IN718 couple obtained by the Transient Liquid Phase Bonding (TLPB) process at temperatures ranging from 800°C to 1000°C. The crystal structure and the chemical composition of the phases formed, including the AlNi intermetallic, were evaluated on a thin lamella (FIB) using TEM-EDS. The evolution of the AlNi layer as a function of bonding time was studied by in-situ high energy synchrotron X-ray diffraction. The AlNi lattice parameter a increases until a maximum of 2.9407 Å and then decreases with the annealing time, suggesting that the chemical composition of AlNi changes with time at constant temperature. This trend is related with the formation of two distinctive layers of AlNi with different chemical composition: Al-rich AlNi and Ni-rich AlNi. The split of the AlNi phase indicates that a chemical partition takes place when Ni and Al concentration equals. The growth kinetics of both layers are controlled by diffusion but with different growth rate constants. These results contribute to the understanding of the solid-state transformations occurring in a multicomponent and multilayered TLP bond under isothermal conditions.

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