Investigation of Surface Integrity in High Speed Milling of Gamma Titanium Aluminide under Dry and Minimum Quantity Lubricant Conditions

Intermetallic alloys based on gamma titanium aluminide are considered to be one of the replacements for nickel-based superalloys. The machinability of γ-TiAl is faced with restrictions due to the alloy's mechanical and metallurgical properties. Machining of γ-TiAl causes defects such as micro cracks. In this study surface integrity of High Speed Milling of γ-TiAl was examined under dry and Minimum Quantity Lubrication condition. Minimum Quantity Lubrication as a sustainable lubrication method in machining processes, improved energy consumption, environmental impact, personal health, while enhancing the machining affected zone properties in comparison with floating method. Three dimensional surface topography and other effects of surface alterations, including deformations of the lamellae and micro cracks were studied. Microhardness evaluation of the surface and subsurface indicated a significant difference between them.