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Due to their high strength/weight ratio and resistance to corrosion and wear, superalloys such as gamma TiAl or Inconel 718 appear as the best choice at the sight of the demands in the vicinity of the combustion chamber. Such kind of parts suffer one last drilling operation at the end of the manufacturing process. The present work is framed within the study of twist drilling in advanced materials used for lightweight applications in aerospace sector. Within this context, the paper presents the results obtained from different tests in gamma TiAl alloys. Tool life tests were performed on three types of γ-TiAl (extruded MoCuSi, ingot MoCuSi and TNB) to define an optimal set of cutting parameters.

Drilling Titanium Aluminides with Twist Drills