The main disadvantages of Ti-6Al-4V alloys include difficult machining, high coefficient of friction, low surface hardness, and poor wear resistance.
- Machining difficulty: Ti-6Al-4V alloy is a difficult-to-machine material with poor thermal conductivity, high chemical activity, low modulus of elasticity, and is prone to work-hardening during the machining process, resulting in low cutting speeds, short tool life and low machining efficiency. In addition, grinding is prone to burns, corrugation and deformation, which increases the difficulty and cost of machining.
- High coefficient of friction: Ti-6Al-4V alloy has a high coefficient of friction, which leads to its poor performance in tribological properties. Low surface hardness and high adhesive contact between surfaces make them susceptible to wear during friction.
- Low surface hardness: The surface hardness of this alloy is low, which makes it perform poorly in terms of abrasion resistance and is prone to wear during friction.
Despite these drawbacks, Ti-6Al-4V alloys are still widely used in many fields, mainly because of their excellent overall properties, including high strength, good corrosion resistance and high specific strength. Their machinability and wear resistance can be improved to some extent by appropriate heat treatment and surface treatment techniques
