Ultrafine fully-lamellar structures in two-phase γ-TiAl alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journal

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Original languageEnglish
Pages (from-to)219-223
Journal / PublicationMaterials Research Society Symposium - Proceedings
Publication statusPublished - 1997
Externally publishedYes


Title1996 MRS Fall Meeting
CityBoston, MA, USA
Period2 - 6 December 1996


Special ultrafine fully-lamellar microstructures have been found recently in γ-TiAl alloys with 46-48 at.% Al, when they are processed or heat-treated above the α-transus temperature (Tα) Hot-extrusion above Tα also produces a refined colony or grain size. Refined-colony/ultrafine-lamellar (RC/UL) microstructures produce an excellent combination of room-temperature ductility and high-temperature strength in Ti-47Al-2Cr-2Nb (at.%) alloys. UL structures generally have an average interlamellar spacing of 100-200 nm, and have regularly alternating γ and α2 lamellea, such that they are dominated by γ/α2 interfaces with relatively few γ/γ twin boundaries. The focus of this study is how variations in processing parameters or alloy composition affect formation of the UL structure, particularly the α2 component.