Development and Properties of Cast TiAl Matrix In Situ Composites Reinforced with Carbide Particles

Juraj Lapin; Alena Klimová; Michaela Štamborská; Kateryna Kamyshnykova; Tatiana Pelachová

doi:10.4028/www.scientific.net/MSF.941.1907

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HomeMaterials Science ForumMaterials Science Forum Vol. 941Development and Properties of Cast TiAl Matrix In...

Development and Properties of Cast TiAl Matrix In Situ Composites Reinforced with Carbide Particles

Abstract:

The In Situ composites with microstructurally different types of intermetallic matrix such as nearly γ (TiAl) (composite A), multiphase with high amount of lamellar α₂(Ti₃Al) + γ (TiAl) regions (composite B) and fully lamellar α₂ + γ (composite C) were prepared by centrifugal casting and consecutive heat treatments of Ti-44.5Al-8Nb-0.8Mo-3.6C-0.1B, Ti-37Al-7Nb-0.8Mo-5.9C-0.1B and Ti-46.4Al-5Nb-1C-0.2B (at.%) alloys, respectively. The centrifugal casting results in a uniform distribution of coarse primary carbide particles in the as-cast samples. Hot isostatic pressing (HIP) and heat treatments have no effect on the Vickers hardness of the in-situ composite B but lead to a significant softening of the in-situ composites A and C. The in-situ composite C with a coarse-grained fully lamellar matrix shows a higher flow stress at 1000 °C and improved creep resistance at 800 °C compared to those of the in-situ composites A and B.

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Periodical:

Materials Science Forum (Volume 941)

Pages:

1907-1913

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.941.1907

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Online since:

December 2018

Authors:

Juraj Lapin*, Alena Klimová, Michaela Štamborská, Kateryna Kamyshnykova, Tatiana Pelachová

Keywords:

Composites, Intermetallic, Mechanical Properties, Microstructure, TiAl

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