Home HOME Kovove Materialy-Metallic Materials 2019 Kovove Materialy-Metallic Materials Vol. 57 (2019), no. 3, pp.151–157

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Kovove Materialy-Metallic Materials Vol. 57 (2019), no. 3, pp.151–157

Title: Effects of C and N additions on primary MAX phase particles in intermetallic Ti-Al-Nb-Mo matrix in-situ composites prepared by vacuum induction melting
Author: A. Klimová, J. Lapin
Abstract: The effects of C and N additions on primary MAX phase particles were studied in in-situ
intermetallic matrix composites with nominal composition Ti-37Al-3.8Nb-1Mo-0.1B-xC-yN
(at.%), where x + y = 5 at.%. The in-situ composites were prepared by vacuum induction
melting and solidification in graphite crucibles. The increasing content of N in the studied
in-situ composites decreases the solubility of Nb in the primary (Ti,Nb)2Al(C,N) MAX phase
particles and leads to a partial substitution of C by N in them at the expense of increasing
content of N in lamellar α2(Ti3Al) + γ(TiAl) matrix. The shape factor increases and volume
fraction and size of the MAX phase particles decrease with increasing content of N. The
increasing content of N in the composites has no significant effect on nanohardness of the
primary particles but increases their elastic modulus.
Keywords: intermetallics, composites, MAX phases, microstructure, hardness
Published online: 21-May-2019
Year: 2019, Volume: 57, Issue: 3 Page From: 151, Page To: 157
doi:10.4149/km_2019_3_151


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