Effect of Si Addition on the Microstructures and Mechanical Properties of TiAl Intermetallics

Abstract:

TiAl/Ti₅Si₃ in situ composites were successfully fabricated by reactive hot-press method from powder mixtures of Ti, Al and Si. The influence of the Si addition on the microstructures and mechanical properties of TiAl/Ti₅Si₃ composites was investigated in detail. The results show that an appropriate amount of addition of Si refined the matrix structure obviously due to the in situ formed Ti₅Si₃, and as a result, the flexural strength and fracture toughness of the composites are modified. When the Si content is 1.82 wt %, the flexural strength and the fracture toughness reach the maximum value of 685.67 MPa and 9.02 MPa·m^1/2, respectively. The enhancing mechanism was also discussed.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 413-416
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.413
• Online since: May 2011
• Authors: Jian Feng Zhu, Wen Wen Yang, Shao Dan Li
• Keywords: Composite, Microstructure, Ti₅Si₃, TiAl

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