The microstructure and phase constituent of TiB

2

/Ti-Al composites prepared by XD

TM

were investigated by XRD

SEM and TEM.It was found that there exists a flake convex facets with （0.2 μm） a lower than thickness whose length reached up to 4 μm on the surface in {1010} facets perpendicular to 〔0001〕orientation of TiB

2

needles

and the orientation of the convex facets is parallel to that of TiB

2

needles.TiB

2

needles

which exists in cruciated or radicalized form

were dispersed at α

2

/γ lamellar matrix.The Al-riched and Ti-riched layers and heterogeneity in supersaturation solution at solid-liquid interface resulted from non-equilibrium solidification may keep solid-liquid interface stable to result in the formation of the structure characteristic of the TiB

2

needles.