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Ti Al B alloys were produced by in situ synthesis method. The phase constitutions, microstructure of these alloys and the morphology of the primary TiB 2 were investigated by XRD and SEM. The results show that these alloys are composed of TiAl and TiB 2, and the primary TiB 2 is hexagonal prism shape. Growth terraces, pyramidal protrusion, and rod shape dendrites are observed on (0001) plane of primary TiB 2. There are thin flake convexes on plane of primary TiB 2, parallel to (0001) plane of the primary TiB 2. The rod shaped crystal orientation and thin flake convexes are parallel to primary TiB 2 where they protrude out. The solid liquid interface morphology of primary TiB 2 during solidification was also investigated. It was indicated that the solid liquid interface morphology of primary TiB 2 is instable and gradually develops into a complicated interface consisted of a few separated secondary interfaces. These secondary interfaces are facet with the same crystalline orientation.
TiAl B alloys were produced by in situ synthesis method. The phase constitutions, microstructure of these alloys and the morphology of the primary TiB 2 were investigated by XRD and SEM. The results show that these alloys are composed of TiAl and TiB 2, and The primary TiB 2 is hexagonal prism shape. Growth terraces, pyramidal protrusions, and rod shape dendrites are observed on (0001) plane of primary TiB 2. There are thin flake convexes on plane of primary TiB 2, parallel to (0001) plane of the primary crystal form and thin flake convexes are parallel to primary TiB 2 where they protrude out. The solid liquid interface morphology of primary TiB 2 during solidification was also investigated. It was indicated that the solid liquid interface morphology of primary TiB 2 is instable and gradually develops into a complicated interface consisting of a few separated secondary interfaces. These secondary interfaces are facet with the same cr ystalline orientation.