Drilling of Intermetallic Alloys Gamma Tial

High-throughput dry drilling of titanium aluminide

“…Because of the poor thermal conductivity of the material, dissipation of heat and chip evacuation is one of the important aspect while drilling TiAl [15]. The thrust and torque are clearly influenced by the feed rate, while it was observed that the impact of cutting speed is comparatively less.…”

“…The presence of superficial cracks, created during hole making progression may result in the failure of this material. It has been reported that in these types of material once the crack propagates a disastrous failure takes place [15]. The low ductility of the material was found as an obstacle for generating defect free surface.…”

“…Poor productivity and surface integrity was the major problem during drilling of TiAl [6]. Beranoagirre et al [15] investigated the impact of process parameters on drilling of three types of TiAl alloy with tungsten carbide coated tools and they established that cutting speed is more influential than the feed rate considering the durability of the drilling tools. They also observed that the failure of this material may occur due to the presence of superficial cracks, generated during the hole making progression.…”

Drilling of γ-TiAl Intermetallic Alloys. Mechanistic Model to Predict Cutting Force and Torque

“…Three manufactured presentations for these alloys are in the market, the TNB alloy, the alloy solidified as ingot, and the alloy extruded after solidification. These are very brittle materials, so a special care must be paid to avoid the chipping and cracking of components during machining processes [35][36]. Besides, two serious disadvantages during their processing are their great sensibility to the impurity during the foundry process and so, high production costs.…”

Hole Making by Electrical Discharge Machining (EDM) of γ-TiAl Intermetallic Alloys

“…This difference in processing results in substantial differences in properties, shown in Figure 2b. The extruded material [24][25][26] has more desirable properties than the ingots. Yield strength, creep strain and endurance limit are much lower in the ingots than in the extruded material.…”