[Kovove materialy - Metallic materials]
    Wed - April 24, 2019 - 16:07 No. of hits : 1012804 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 56 (2018), Issue 6

Effect of carbon on the room temperature compressive behaviour of Ti-44.5Al-8Nb-0.8Mo-xC alloys prepared by vacuum induction melting
STAMBORSKA, M., LAPIN, J., BAJANA, O.
vol. 56 (2018), no. 6, pp. 349 - 356

Abstract
The effect of carbon content x ranging from 1.4 to 3.6 at.% on the room temperature compressive behaviour of Ti-44.5Al-8Nb-0.8Mo-xC (at.%) alloys prepared by vacuum induction melting has been studied. The microstructural analysis by SEM shows that the increase of the carbon content increases the volume fraction of the reinforcing carbide particles and leads to a change of the matrix microstructure from α2(Ti3Al) + γ(TiAl) + β/B2 to γ type. The carbon content affects the morphology and size of the primary plate-like, regular and irregular shaped Ti2AlC particles. The finite element analysis (FEA) of local equivalent strains and quantitative metallography analysis indicate that the mean size of fragmented carbide particles decreases with increasing local equivalent strain in the compression specimens. The differences in work hardening behaviour of the compression specimens with various content of carbon are related to the initial non-uniform deformation, cracking of primary carbide particles, crack propagation and release of some grains from the free surface during compression testing.

Key words
TiAl, composites, mechanical properties, microstructure, finite element analysis

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
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