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000398566 1001_ $$0P:(DE-H253)PIP1022069$$aWang, Li$$b0$$eCorresponding author
000398566 245__ $$aMorphology evolution of $\mathrm{Ti_3}$AlC carbide precipitates in high Nb containing TiAl alloys
000398566 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2017
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000398566 520__ $$aThis work elucidates the morphology evolution of perovskite Ti$_3$AlC carbides in a Ti-45Al-5Nb-0.75C alloy during ageing at 800 °C. The carbides in the $\gamma$ matrix are initially needle-shaped with their long axis parallel to the [001] lattice direction of the γ matrix. After extended annealing, they decompose into small carbide sub-particles. By combining different transmission electron microscopy characterization methods and atom probe tomography it has been verified that the carbides first split into several parallel needles that are aligned along the [001]$\gamma$ lattice direction. Later these parallel needles further decompose into numerous small sub-particles, while the matrix phase region between the sub-particles crystallographically reorients. To the authors' knowledge this is the first work which demonstrates such a precipitate splitting process in a matrix with a tetragonal crystal structure. It is proposed that the decomposition into small sub-particles is energetically favourable owing to the elastic interaction energy between the split sub-particles.
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000398566 7001_ $$0P:(DE-HGF)0$$aZenk, Carolin$$b1
000398566 7001_ $$0P:(DE-H253)PIP1011120$$aStark, Andreas$$b2
000398566 7001_ $$0P:(DE-HGF)0$$aFelfer, Peter$$b3
000398566 7001_ $$0P:(DE-HGF)0$$aGabrisch, Heike$$b4
000398566 7001_ $$0P:(DE-HGF)0$$aGöken, Mathias$$b5
000398566 7001_ $$0P:(DE-HGF)0$$aLorenz, Uwe$$b6
000398566 7001_ $$0P:(DE-H253)PIP1013067$$aPyczak, Florian$$b7
000398566 773__ $$0PERI:(DE-600)2014621-8$$a10.1016/j.actamat.2017.07.018$$gVol. 137, p. 36 - 44$$p36 - 44$$tActa materialia$$v137$$x1359-6454$$y2017
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