Structural Transformations Occurring during the Formation of TiAl3-Based Composites Reinforced by TiB2 or TiC Hard Particles

Adelya A. Kashimbetova; Alexander Thoemmes; Ivan V. Ivanov

doi:10.4028/www.scientific.net/KEM.769.48

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 769Structural Transformations Occurring during the...

Structural Transformations Occurring during the Formation of TiAl₃-Based Composites Reinforced by TiB₂ or TiC Hard Particles

Abstract:

This work is devoted to investigation of the structure of Ti-TiAl₃ composites reinforced by TiB₂ or TiC hard particles and obtained by spark plasma sintering of elemental foils and ceramic powders. Sintering was carried out at the temperature of 830 oC under the pressure of 40 MPa during 10 minutes. Microstructure of the composites obtained was represented by alternated layers of titanium and intermetallic compound TiAl₃. Also, it was found that at the Ti-TiAl₃ interfaces thin intermediate layers were formed. Quantitative elemental analysis of these layers showed that Ti₃Al, TiAl, and TiAl₂ compounds, as well as Ti (Al) solid solution could be formed in these zones. Diffraction analysis did not reveal any transformations of initial reinforcing phases after sintering. Interlayers with titanium diboride had the average microhardness level of 3988 HV, and the average microhardness level of interlayers with TiC was 1610 HV.

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Key Engineering Materials (Volume 769)

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48-53

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https://doi.org/10.4028/www.scientific.net/KEM.769.48

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Online since:

April 2018

Authors:

Adelya A. Kashimbetova*, Alexander Thoemmes, Ivan V. Ivanov

Keywords:

Composite, Intermetallic, Multi-Layered Composite, Spark Plasma Sintering, TiAl, Titanium Aluminide

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