Mechanical properties of friction welded joint between Ti-6Al-4V alloy and Al-Mg alloy (AA5052)

The present paper describes the mechanical properties of a friction welded joint between Ti - 6Al 4V alloy and Al - Mg alloy (AA5052). The Ti - 6Al - 4V/ AA5052 - H112 joint, made at a friction speed of 27.5 rev s(-1), friction pressure of 30 MPa, friction time of 3.0 s, and forge pressure of 60 MPa, had 100% joint efficiency and fractured in the AA5052 - H112 base metal. The Ti - 6Al - 4V/ AA5052 - H34 joint, made under the same friction welding conditions, did not achieve 100% joint efficiency and it fractured in the AA5052 - H34 base metal because the AA5052 - H34 base metal had softened under friction heating. The joints made at low friction speed or using short friction time showed fracture at the welded interface because a sufficient quantity of heat for welding could not be produced. However, the joints made at high friction speed or using long friction time were also fractured at the welded interface: in this instance, the welded interface also had an intermetallic compound layer consisting of Ti2Mg3Al18. The Ti - 6Al - 4V/ AA5052 - H34 joint made at a friction speed of 27.5 rev s(-1) with friction pressure of 150 MPa, friction time of 0.5 s, and forge pressure of 275 MPa had 100% joint efficiency and fractured in the AA5052 - H34 base metal, although the AA5052 - H34 side softened slightly. In conclusion, the Ti - 6Al - 4V/ AA5052 - H112 joint and Ti - 6Al 4V/ AA5052 - H34 joint had 100% joint efficiency and fractured in the AA5052 base metal when made under the friction welding conditions described above.