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Effect of Zr substitution by Ti on growth direction and interface structure of LaB6-TixZr1−xB2 directionally solidified eutectics

Abstract : Boride ceramics were directionally solidified around LaB6-(TixZr1−x)B2 eutectic compositions. The directionally solidified rods were composed of LaB6 rich concentric belts surrounding large eutectic regions with a dense and uniform distribution of (TixZr1−x)B2 fibers of 0.6 μm in diameter inside a LaB6 matrix. The di- and hexa-boride mole fractions at eutectic points have been more accurately defined for x = 0-0.76. Fiber growth directions were modified by the addition of titanium. Diboride (subscript 2) fibers grew along [0 0 0 1]2 for x = 0 and along View the MathML source〈1¯ 1 0 0〉2 for x ≠ 0. The orientation of the hexaboride (subscript 6) matrix was unchanged with or without titanium addition. The favored crystallographic orientation relationship was: [0 0 1]6//[0 0 0 1]2 and View the MathML source(1 1 0)6//(1 1 2¯ 0)2 and View the MathML source(1¯ 1 0)6//(1¯ 1 0 0)2 for any x value. The dominant interfaces were View the MathML source{1 1 0}6//{1 1 2¯ 0}2 for x = 0 and (0 0 1)6//(0 0 0 1)2 for x ≠ 0, the latter being expected to be energetically more favorable, as predicted by a 2D geometrical model.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00990615
Contributeur : Bibliothèque Umr7633 <>
Soumis le : mardi 13 mai 2014 - 16:29:17
Dernière modification le : jeudi 24 septembre 2020 - 18:30:07

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Isabelle Jouanny, Mohamed Sennour, Marie-Hélène Berger, V.B. Filipov, A. Ievdokymova, et al.. Effect of Zr substitution by Ti on growth direction and interface structure of LaB6-TixZr1−xB2 directionally solidified eutectics. Journal of the European Ceramic Society, Elsevier, 2014, 34, pp.2101-2109. ⟨10.1016/j.jeurceramsoc.2014.01.026⟩. ⟨hal-00990615⟩

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