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Research Article | Open Access

Microstructure and mechanical properties of Ti3(Al,Ga)C2/Al2O3 composites prepared by in situ reactive hot pressing

Yuan FANG, Xiaohua LIU, Yuxia FENG, Jianfeng ZHU( ), Wei JIANG
School of Material Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi’an 710021, China
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Abstract

In this study, Ti3(Al,Ga)C2/Al2O3 composites were successfully synthesized by in situ hot pressing at 1350 ℃ for 2 h using Ti, Al, TiC, and Ga2O3 as raw materials. X-ray diffraction and scanning electron microscopy were used for characterizing the phase identities and microstructures of the sintered composites. The dependence of the Vickers hardness and flexural strength on the Al2O3 content was found to be in single-peak type. Ti3(Al0.6,Ga0.4)C2/10.3vol%Al2O3 composite exhibited significantly improved mechanical properties. Vickers hardness and flexural strength of the composite reached 6.58 GPa and 527.11 MPa, which were 40% and 74% higher than those of Ti3AlC2, respectively. Formation of solid solution and incorporation of second phase of Al2O3 resulted in the opposite influence on the fracture toughness. Finally, the hardening and strengthening mechanisms were discussed in detail.

Keywords

Ti3AlC2solid solutionceramic compositesmicrostructuremechanical properties

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Journal of Advanced Ceramics
Volume 9 Issue 6,
December 2020
Pages 782-790
DOI: 10.1007/s40145-020-0428-z

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Cite this article:
FANG Y, LIU X, FENG Y, et al. Microstructure and mechanical properties of Ti3(Al,Ga)C2/Al2O3 composites prepared by in situ reactive hot pressing. Journal of Advanced Ceramics, 2020, 9(6): 782-790. https://doi.org/10.1007/s40145-020-0428-z

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Received: 22 July 2020
Revised: 15 September 2020
Accepted: 26 September 2020
Published: 13 November 2020
© The Author(s) 2020

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