Comparison of Al/Ni and Co/Ni Interdiffusion Coefficients in Pseudobinary Sections of Ni3Al-Co alloys

0177908 - UFM-A 20023096 RIV CZ eng C - Conference Paper (international conference)
Gazda, Aleš - Rothová, Věra - Čermák, Jiří
Comparison of Al/Ni and Co/Ni Interdiffusion Coefficients in Pseudobinary Sections of Ni3Al-Co alloys.
Diffusion and Thermodynamics of materials /8./. Brno: Masaryk University, Brno, 2002 - (Čermák, J.; Vřešťál, J.), s. 266
[Diffusion and thermodynamics of materials /8./. Brno (CZ), 04.09.2002-06.09.2002]
R&D Projects: GA ČR GA106/00/0173
Institutional research plan: CEZ:AV0Z2041904
Keywords : interdiffusion * nickel aluminides
Subject RIV: BM - Solid Matter Physics ; Magnetism

Interdiffusion in Ni3Al intermetallic alloyed by 0 - 19 at % Co was studied in three pseudo-binary sections: c(Al) = 22, c(Co) = 3.5, and c(Co) = 16 (c in at. %). The experiments were carried out at temperatures between 900 and 1200°C. Since no detectable shift of tungsten inert markers was observed, it was concluded that the intrinsic diffusivities of element pairs with varying concentration (Al/Ni and Co/Ni) in respective pseudo-binary sections are approximately equal one to another. The interdiffusion in pseudo-binary alloys Al/Ni (c(Co) = const.) runs slightly faster than that in pseudo-binary alloys Ni/Co (c(Al) = const.). The relations between the measured interdiffusion coefficients in the Ni3Al-Co ordered gamma prime phase agree well with literature data for the interdiffusion coefficients in both pure gamma prime and Co alloyed gamma prime phases and also for the disordered Al-Ni and Co-Ni solid solutions. They are qualitatively explained by interaction between constituents and/or by their interaction with vacancies.
Permanent Link: http://hdl.handle.net/11104/0074811