Flexural elastic limit of Zr₆₁Ti₂Cu₂₅Al₁₂ amorphous alloy under four-point bending loading mode

The bending test of Zr₆₁Ti₂Cu₂₅Al₁₂ amorphous alloy was designed according to the span-thickness ratio recommended in the current metal material bending performance test standard, and the specimen would undergo large deflection elastic deformation. It was proved that the upper limit of the span-to-thickness ratio of the bending specimen without large deflection elastic deformation depended on the elastic strain limit of the material. The elastic strain limit of the zirconium-based amorphous alloy was 2%, and the upper limit of the span-to-thickness ratio without large deflection elastic deformation in the four-point 1/4 bending mode was 22. Under the premise of ensuring small deflection deformation, through the four-point bending cyclic loading and unloading test, the bending yield stress corresponding to the initial shear deformation of the outermost surface of the Zr₆₁Ti₂Cu₂₅Al₁₂ alloy sample was about 1 760 MPa, and the bending elastic limit σ_p0.01 corresponding to 0.01% residual strain was 2 040 MPa.