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- W2973056167 endingPage "108930" @default.
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- W2973056167 abstract "The effect of vacuum induction melting (VIM) and casting on chemical composition and microstructure of TiAl-based matrix in-situ composites with nominal compositions Ti-xAl-8Nb-3.6C-0.8Mo (at.%), where x = 38, 42 and 45 at.%, was studied. The composites were prepared by VIM in graphite crucibles followed by tilt or centrifugal casting into graphite moulds under vacuum. The VIM under a vacuum pressure of 103 Pa results in the chemical compositions corresponding well to the nominal ones. The microstructure of the tilt and centrifugally cast composites consists of primary (Ti,Nb)2AlC particles with a small amount of (Ti,Nb)C phase and matrices composed of α2(Ti3Al), γ(TiAl) and β/B2 phases. The centrifugal casting leads to the finer primary carbide particles in the studied composites, higher volume fraction of β/B2 phase in Ti–38Al–8Nb-3.6C-0.8Mo and higher volume fraction of the single γ phase regions in Ti–42Al–8Nb-3.6C-0.8Mo and Ti–45Al–8Nb-3.6C-0.8Mo compared to those in the tilt cast ones. The heat treatment results in the full transformation of (Ti,Nb)C phase to (Ti,Nb)2AlC and elimination of the differences between the matrices of the composite prepared by different casting technologies. The Vickers hardness of the heat-treated centrifugally cast in-situ composites remains higher than that of the tilt cast ones." @default.
- W2973056167 created "2019-09-19" @default.
- W2973056167 creator A5048115985 @default.
- W2973056167 creator A5088588637 @default.
- W2973056167 date "2019-11-01" @default.
- W2973056167 modified "2023-09-27" @default.
- W2973056167 title "Vacuum induction melting and casting of TiAl-based matrix in-situ composites reinforced by carbide particles using graphite crucibles and moulds" @default.
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- W2973056167 doi "https://doi.org/10.1016/j.vacuum.2019.108930" @default.
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