ABSTRACT
Fully lamellar TiAl-based alloys have been examined with the aim of understanding the mechanism of slip transfer between the soft gamma phase and the hard alpha-2 phase in grains oriented with the basal plane in the alpha-2 either parallel to or perpendicular to stress axis. It has been shown that twinning dislocations in the gamma lamellae give rise to dislocations of b=1/6<112¯6>https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003063056/c87f8d57-bd6e-40f8-a651-90760b6f3961/content/ieq0286.tif"/> and b=1/3<112¯0>https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003063056/c87f8d57-bd6e-40f8-a651-90760b6f3961/content/ieq0287.tif"/> in alpha-2. Possible reactions which generate dislocations of b=1/6<112¯6>https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003063056/c87f8d57-bd6e-40f8-a651-90760b6f3961/content/ieq0288.tif"/> and <112¯0>https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781003063056/c87f8d57-bd6e-40f8-a651-90760b6f3961/content/ieq0289.tif"/> in the alpha-2 from the twinning dislocations in the gamma are proposed.
