THE α_2/γ INTERFACIAL STRUCTURE CHANGES IN A DUAL-PHASE γ-TiAl ALLOY AFTER HOT DEFORMATION AND SUBSEQUENT SHORT-TIME ANNEALING

1.Introduction Thetwo--phaseac--Ti-Al--basedalloysarecurrentlyunderextensiveinvestigationdueto theirbettermechanicalproperties'].Afullylamellaroranearlylamellarmicrostructure consistingofalargenumberoflamellarcolonieswithafewequiaxedac--grainsisusually preferred.Theacplateinthelamellarstructureusuallykeepsaconventionalorientation relationshipwiththeadZplate,{III}.//{0001}.,and<110>.//<1120>...Thisisformed bythephasetransformatiollofeitheror~or ac~adZ acoror~adZ~adZ ac,de…