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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. Onlyreflection 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 ( B) and 0.2% proof stress ( 0:2) remained almost constant. Above 4.5 mass%,  B and  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 0Al 12.6 1.21 <0.01 0.009 0.008 0.074 3.0Al 12.7 1.19 2.98 0.009 0.007 0.072 4.5Al 12.6 1.18 4.47 0.008 0.006 0.063 6.0Al 13.1 1.37 6.17 0.007 0.005 0.062

The Effect of Al Content on Tensile and Fatigue Properties of Solution-Treated and Quenched Ti-13Cr-1Fe Alloys