Abstract: Zr-Cu-Ni-Al amorphous alloy compositions are designed according to binary eutectic mixing method, and are prepared by copper mold suction casting method. XRD, DSC, SEM and quasi-static compression tests were utilized to research the amorphous forming ability and mechanical properties of Zr-Cu-Ni-Al alloys. The results show that the designed Zr-Cu-Ni-Al alloys are completely amorphous structure, and their supercooled liquid region (ΔTx) exceeds 65 K, and they have good amorphous forming ability. Among them, Zr55.7Cu22.4Ni7.2Al14.7 alloy has the widest ΔTx, reaching 82 K. The plastic deformation ability of the alloys from low to high is: Zr57Cu18.67Ni8Al16.33, Zr56.36Cu20.53Ni7.6Al15.51, Zr54.4-Cu26.13Ni6.4Al13.07 and Zr55.7Cu22.4Ni7.2Al14.7. The plasticity of Zr55.7Cu22.4Ni7.2Al14.7 alloy reaches 5.5%, and the compressive strength reaches 1 885 MPa, while the plasticity of the other three alloys is less than 2%. The stronger the initiation and interaction of the shear bands, the higher the plasticity and strength of Zr-Cu-Ni-Al bulk amorphous alloys. There are droplets in the fracture of the alloy samples, which indicates that during the deformation of the alloys, the alloy structure at the fracture has viscous flow, accompanied by the generation of vein patterns. The serration rheology occurs in all alloys during plastic deformation, and the serration rheology is closely related to the change of free volume.
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2021, Vol. 35 
