Abstract:ZrAl alloys with three different Al contents (6.0, 7.0, 8.0, wt%) were melted by the non-consumable electric-arc furnace. Zr3Al-based alloys with different phase compositions were obtained by peritectoid reaction during the annealing process. Microstructures and phase compositions of alloys was studied by optical microscope and XRD, and then its microhardnesses and tensile properties were tested. The results show that the microhardness of as-cast ZrAl alloys increases with the increase of Al content. Homogeneous microstructure of Zr3Al-based alloys can be obtained by annealing. Its microhardness and tensile strength are relative to matrix grain size and phase composition, but independent of the form and distribution of the second phases. Microhardness and tensile strength of the annealed alloy increase with the increase of Zr3Al content, while the elongation decreases. In addition, microhardness, tensile strength and elongation of the annealed alloys increase with Zr3Al grain refinement