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采用“二元共晶混合”法设计富Ti基Ti-Cu-Ni-Zr合金成分,通过水冷铜模铸造法制备出不同直径Ti-Cu-Ni-Zr合金棒材。利用X射线衍射仪(XRD)、差示扫描量热仪(DSC)、万能试验机和扫描电镜(SEM)研究合金的玻璃形成能力和力学性能。结果表明,Ti-Cu-Ni-Zr合金具有较高玻璃形成能力,其中Ti_(38)Cu_(45.26)Ni_(9.14)Zr_(7.6)合金最大临界直径为3 mm;Ti-Cu-Ni-Zr合金玻璃形成能力与Trg值关系较大,而与ΔTx、γ值关系较小。通过对合金力学性能进行研究,结果表明,Ti_(38)Cu_(45.26)Ni_(9.14)Zr_(7.6)非晶合金具有屈服强度1 937 MPa,断裂强度2 071 MPa,且具有0.6%的塑性,而Ti_(39)Cu_(43.8)Ni_(9.6)Zr_(7.6)非晶合金断裂机制为完全脆性断裂;对于完全脆性断裂的Ti_(39)Cu_(43.8)Ni_(9.6)Zr_(7.6)非晶合金,主剪切面和次剪切带可能同时发生。
Ti-Cu-Ni-Zr alloy with Ti-base is designed by using “binary eutectic mixing” method, and Ti-Cu-Ni-Zr alloy rods with different diameters are prepared by water- The glass formation and mechanical properties of the alloys were investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), universal testing machine and scanning electron microscope (SEM). The results show that the Ti-Cu-Ni-Zr alloy possesses high glass-forming ability. The maximum critical diameter of Ti_ (38) Cu_ (45.26) Ni_ (9.14) Zr_ (7.6) The glass forming ability of alloy has a great relationship with the value of Trg, but has little to do with the values of ΔTx and γ. The results show that the Ti_ (38) Cu_ (45.26) Ni_ (9.14) Zr_ (7.6) amorphous alloy has a yield strength of 1 937 MPa, a fracture strength of 2 071 MPa and a plasticity of 0.6% However, the fracture mechanism of Ti_ (39) Cu_ (43.8) Ni_ (9.6) Zr_ (7.6) amorphous alloy is completely brittle fracture. For the completely brittle fracture Ti_ (39) Cu_ (43.8) Ni_ (9.6) Zr_ Alloys, primary shear planes and secondary shear zones may occur simultaneously.