Machining of Ti-6Al-4V ELI Alloy: A brief review

Abstract

Ti-6Al-4V ELI has similar properties as of Ti-6Al-4V (Grade 5) except it has higher ductility as well as improved fracture toughness. It has the ability to withstand high temperature without losing properties, highly corrosion endurance and high strength to weight ratio. So it's widely applicable in biomedical implants, aerospace industry, military application, automobile component and high pressure cryogenic vessels. During the machining of the titanium alloys, a lot of machining difficulty occurs due to its hardness, chemical reaction take place between tool and machine workpiece, high amount of heat generated at cutting zone. Cutting speed and cutting feed are predominant factors for cutting tool wear as well as the finished quality of the surface. Mainly flank wear (adhesion), notch wear and crater wear (diffusion) are identified during the machining. Cutting temperature indirectly influenced the surface quality of machined surface and tool wear. The high cutting speed with low feed rate is a most favourable combination for cutting force. For cutting insert, performance tool coating plays a significant role and coated inserts performed better than the uncoated tool at various cutting conditions. Machining under minimum quality lubrication is more favourable than flooded and dry scenario.

Surface generation on titanium alloy through powder-mixed electric discharge machining with the focus on bioimplant applications

“…This advanced variant of Tialloy has a low percentage of interstitials imparting superior thermo-mechanical properties concerning bioimplant applications. It also possesses a similar nature/properties to Ti6Al4V except for high durability and excellent fracture resistance [6]. Therefore, the above-said features recommend the Ti6Al4V ELI as a first choice in the biomedical field, i.e., bio-implants development and the surgical tool industry [7].…”

The Effect of Solution Treatment Temperature on Hardness, Microstructure, and Corrosion Resistance of Ti-6Al-4V ELI

“…The impurities in Ti64 ELI, such as oxygen, carbon, and iron, are deliberately restrained as they directly affect its properties. Thus, the ductility and fracture toughness of Ti64 ELI outperforms the commercial Ti-6Al-4V [6][7][8].…”

Preparation method of low-oxygen Ti-6Al-4V alloy by solid state re-deoxidation using calcium

“…The Ti-6Al-4 V ELI grade significantly reduces impurity elements such as O and N and improves ductility and fracture toughness. Compared to standard grade Ti-6Al-4 V alloy, it has excellent damage tolerance and cryogenic mechanical properties [6]. The extra-low oxygen content in titanium alloys is considered to be of critical importance, and in many applications low oxygen content is required for a wide range of industrial standards [4,[7][8][9].…”