In:
International Journal of Materials Research, Walter de Gruyter GmbH, Vol. 101, No. 4 ( 2010-04-01), p. 523-526
Kurzfassung:
It is very important to understand the development of the microstructure in the interdiffusion zone between coatings and superalloy substrates for designing bond coat materials. In this study, the reaction-diffusion phenomena in the Ir-coating/Ni – Al binary substrate system are simulated using the phase-field model. The thermodynamic database developed based on the CALPHAD method is directly incorporated in the simulation. The effect of coating thickness on the growth of the secondary precipitated -phase is discussed. In the case of a semi-infinite system, the thickness of the -phase increases proportionally with the square root of time. In the case of a thin (1 thick) coating, inconstant -phase growth is observed. It is suggested that the phase growth is related to the change in the -phase fraction, which is derived from a thermodynamic line calculation from the substrate composition to pure Ir.
Materialart:
Online-Ressource
ISSN:
2195-8556
,
1862-5282
Sprache:
Englisch
Verlag:
Walter de Gruyter GmbH
Publikationsdatum:
2010
ZDB Id:
2232675-3
ZDB Id:
2128058-7
ZDB Id:
203021-4
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