Abstract
In beta quenched Ti-Fe-Cr alloys prepared using ferro-chromium alloy, pure Fe or pure Cr and as targeting composition to electron-to-atom ratio (e/a) of 4.28, phase constitution and tensile properties were investigated by electrical resistivity measurement, X-ray diffraction and tensile testing.
In all alloys, beta phase was only identified by X-ray diffraction at room temperature. Resistivity and Vickers hardness decreased with increase in Cr content as a substitute for Fe on condition that 4.28 as e/a is maintained, whereas resistivity ratio increased with Cr content. These changes will be due to decrease in volume fraction of athermal omega with increase in Cr content.
Tensile strength slightly decreased with increase in Cr content, whereas elongation and reduction in area obviously increased. The tensile properties of the quenched Ti-Fe-Cr alloys were not worse than those of commercial beta Ti alloys, excepting Ti-7.1Fe alloy. It is considered that addition of Cr as a substitute for Fe will improve balance between tensile strength and ductility.
