INVESTIGATION ON 1/3[111] FRANK LEDGE DISLOCATIONS AT α_2/γINTERFACE IN HOT-DEFORMED Ti-45Al-10Nb ALLOY

1.IntroductionConsiderableattentionhasbeenfocusedontwo-phaseTiAl-Ti3AlintermetaJlicalloysforapplicationsintheaerospaceindustrybecausethetwo-phasemicrostructureconsistingofprimaryTiAl(ry)phaseandlqpsellarTi3Al(a2) TiAlstructurecansiginficantlyimprovetheroomtemperatureductility1-3],whichisprimari1yduetothepresenceofthelamellarstructure.'InthetwcrphaseTiAlalloys,theorientationrelationshipsbetweenneighboringa2-TisAlandry-TiAllamellaearewelldefinedas(ooo1).2/{111}ryand<112o>.2/<11o>rywiththe…