[Kovove materialy - Metallic materials]
    Thu - March 28, 2024 - 22:02 No. of hits : 1736492 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 42 (2004), Issue 2

Effect of heat treatment on microstructure of dendrites in a directionally solidifed multiphase nickel-based intermetallic alloy (in Slovak)
VANO, A., PELACHOVA, T.
vol. 42 (2004), no. 2, pp. 121 - 131

Abstract
The effect of heat treatment on the microstructure of dendrites in directionally solidified Ni-22.2Al-8.1Cr-5Ti-0.8Mo-0.58Zr (at.%) alloy was studied. The heat treatment consisted of three-step solution annealing (1323 K/4 h, 1373 K/6 h and 1503 K/6 h) and precipitation hardening in the temperature range from 1223 to 1323 K for 1 up to 25 h in air. It was found that during precipitation hardening the growth of α-Cr precipitates is controlled by volume difusion of Cr in β(NiAl) dendrites according to the relationship d3 ∝ t. The growth of γ'(Ni3Al) precipitates is controlled by the diffusion along γ'/β interfaces according to the relationship d4 ∝ t. The parameters of kinetic equations for coarsening of these precipitates were calculated, which allow to predict the precipitate size during the heat treatment.

Key words
nickel aluminides, NiAl, precipitation, kinetics, microstructure, heat treatment

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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