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The microcracking behaviour of TiAl-based alloys with the duplex and fully-lamellar microstrcutures was studied during compression. It was found that the fracture involves propagation of the existing microcracks and development of more new nuclei, instead of being a nucleationcontrolled event. The lamellar interfaces, especially those having an angle of about 0~30℃ to the loading axis, were found to be the favourable nucleation sites. Microcrack nucleation is likely to be initiated by tensile normal stress concentrated on the lamellar interfaces.
The microcracking behavior of TiAl-based alloys with the duplex and fully-lamellar microstrcut was studied during compression. It was found that the fracture involves propagation of the existing microcracks and development of more new nuclei, instead of being a nucleation controlled event. The lamellar interfaces , especially those having an angle of about 0-30 ° C to the loading axis, were found to be the favourable nucleation sites. Microcrack nucleation is likely to be initiated by tensile normal stress concentrated on the lamellar interfaces.