Influence of Cr₂O₃ Addition on the Properties of TiAl Composites

Abstract:

Using Ti, Al and Cr₂O₃ as starting materials, Al₂O₃ particulate reinforced TiAl composites have been fabricated by in-situ reaction synthesis method. Effects of the Cr₂O₃ addition on the microstructures and mechanical properties of the TiAl/Al₂O₃ composites were investigated in detail. The results show that the composites have a matrix of TiAl, Ti₃Al, and minor Cr containing phases, and a second reinforcement Al₂O₃. The addition of Cr₂O₃ effectively refined the structure of the matrix, and as a result, the mechanical properties of TiAl composites are improved. At Cr₂O₃ 7.36 wt%, the flexural strength and fracture toughness reach the maximum values of 634.62 MPa and 9.79 MPa·m^1/2, which are increased by 80% and 30%, respectively. The strengthening mechanism is also discussed.

• Periodical: Advanced Materials Research (Volumes 230-232)
• Pages: 789-792
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.230-232.789
• Online since: May 2011
• Authors: Jian Feng Zhu, Wen Wen Yang, Fang Ni Du
• Keywords: Al₂O₃, Composite, Cr₂O₃, TiAl

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