The effect of Al content on tensile and fatigue properties of solution-treated and quenched Ti-13Cr-Fe alloys

The effect of Al content on tensile and fatigue properties of Ti-13Cr-1Fe alloys was investigated by measurement of electrical resistivity and Vickers hardness, X-ray diffractometry (XRD), and tensile and fatigue tests. Only beta reflection was detected by XRD in all alloys quenched from 1173 K. Resistivity at room and liquid nitrogen temperatures increased monotonically with Al content. Vickers hardness slightly increased with Al content up to 4.5 mass%. In 6.0 mass%Al, the Vickers hardness increased dramatically. In 0 mass%Al and 3.0 mass%Al, the tensile strength (90 and 0.2% proof stress (sigma(0.2)) remained almost constant. Above 4.5 mass%, sigma(B) and sigma(0.2) increased with increasing Al content. S-N curves in high cycle fatigue test of 0 mass%Al and 3.0 mass%Al showed almost the same behavior. The stress at 10(7) cycles, i.e. the fatigue strength, was around 460 MPa.