The low thermal conductivity of these materials does not allow the heat generated during machining to be carried away by chip breaking, and the high work hardening tendency of titanium alloys may also result in high cutting forces and high cutting temperatures, resulting in cutting edge breakage at cutting depth.
Alpha-beta (α-ß) titanium alloys, these alloys have both α and ß phases and contain both a and ß stabilizers. The simplest and most popular alloy in this group is Ti6Al4V, used mainly in the aerospace industry. These alloys are easy to form and have high room temperature strength and moderate high temperature strength. The properties of these alloys can be changed by heat treatment.
Beta (ß) alloys contain transition metals such as V, Nb, Ta, and Mo that stabilize the ß phase. Commercial ß alloys mainly include Ti11.5 Mo6Zr4.5 Sn, Ti15V3Cr3Al3Sn and Ti5553. Beta alloys are easy to heat treat, usually weldable and have high strength. Under the condition of solution treatment, it has excellent predictable formability. However, ß alloys are prone to ductility and brittleness transitions, making them unsuitable for low temperature applications. Beta alloys have good combination or properties in plate, thick profiles, fasteners and spring applications.
