Citation

Mitra R, Eswara Prasad N, Mahajan VR. Transactions of the Indian Institute of Metals 2008; 61(5): 427-433.

Copyright

(Copyright © 2008)

DOI

10.1007/s12666-008-0075-5

PMID

unavailable

Abstract

The demand for materials to be used in the components operating above 110°C in advanced aero-engines drives the development of the silicide-based intermetallic alloys and composites, including the titanium suicides. The mechanical behaviour of Ti5Si3 and its composites has been reviewed with emphasis on the microstructure-property relationships. It is found that the grain size is a critical parameter, and smaller grain sizes are desirable for reducing the magnitude of internal residual stress caused by the cristallographic anisotropy in coefficients of thermal expansion. The reduction in grain size leads to significant improvement in hardness, room temperature flexural strength and fracture toughness. On the other hand, the high temperature strength observed at slow strain rates and creep resistance are higher in the samples with the coarser grain sizes. Further improvements in the strength, fracture toughness and high temperature creep resistance are possible, either through the development of multiphase alloys, or by the use of ceramic reinforcements in composites.

Language: en