Abstract
Machinability of Ti-47.7at%Al intermetallic compound having TiAl-Ti_3Al full lamellar structure is investigated by orthogonal cutting test using cemented carbide tool K10. Defects such as cracks, peelings due to brittle fracture along with the direction of lamellar were observed on the machined surface. The larger brittle cracks were occurred in cutting by tool with the rake angle of +5°. For machining in the rake angle of -5°, the depth of crack occurrence was independent on the direction of lamellar. On the other hand, for machining in the rake angle of +5°, it increased rapidly at the lower angle between lamellar direction and cutting direction than 90°.
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