锆基块体非晶合金由于其临界尺寸大、耐腐蚀性能优异、强度和弹性极限高、Young's模量相对较低，在承重结构材料及生物医学材料方向有着巨大的应用潜力。本工作以Zr-Ti-Cu-Al合金体系为对象，利用XRD、DSC、SEM及电化学实验等手段研究了Ag替换Cu对Zr₅₅Ti₃Cu_{32 - x} Al₁₀Ag _x (x = 0、1、1.5、2和2.5，原子分数，%)块体非晶合金的玻璃形成能力、晶化动力学、力学性能和耐腐蚀性能的影响。结果表明，适量Ag替换Cu改善了该合金体系的玻璃形成能力，显著增加了晶化激活能(E_g、E_x、E_p1、E_p2)，提高了热稳定性。合金的断裂强度随Ag含量的增加而提高，当Ag含量为1.5%时，压缩变形高达5.49%，相较初始体系提升了120%。在磷酸缓冲液(PBS)与模拟体液(SBF)中进行的电化学腐蚀分析表明，Ag的添加提高了Zr₅₅Ti₃Cu_{32 - x} Al₁₀Ag _xBMG在SBF和PBS溶液中的耐生物腐蚀能力。

Bulk metallic glasses (BMGs) have unique microstructures that result in excellent physical and chemical properties. In this study, the impact of replacing Cu with Ag on the glass-forming ability (GFA), crystallization kinetics, mechanical properties, and corrosion resistance of the Zr₅₅Ti₃Cu_{32 - x} Al₁₀Ag _x (x = 0, 1, 1.5, 2, and 2.5; atomic fraction, %) BMGs in the Zr-Ti-Cu-Al alloy system was examined, aiming to develop new Ni/Be-free BMGs for biomedical applications. XRD and DSC analyses demonstrate that replacing Cu with appropriate amounts of Ag improves the GFA of the alloy system and considerably increases the crystallization activation energy (E_g, E_x, E_p1, and E_p2), thereby enhancing thermal stability. From a thermodynamic perspective, Ag has a large negative heat of mixing with other elements. Furthermore, the addition of Ag enhances the interaction among components and promotes chemical short-range ordering in liquid, which can improve the local filling efficiency and inhibit the long-range diffusion of atoms, thereby improving the GFA. At the atomic level, Ag exhibits a considerable atomic radius disparity with the primary constituents, and its inclusion can generate a proficient and localized stacking configuration, thereby achieving reduced internal energy and augmented viscosity and enhancing the GFA of Zr₅₅Ti₃Cu_{32 - x} Al₁₀Ag _x BMG. Mechanical property tests showed that the fracture strength increased with the increase of Ag content. In addition, the compressive deformation ability of Zr₅₅Ti₃Cu_{32 - x}Al₁₀Ag _x BMGs is improved by the addition of appropriate Ag. The compressive strain of the new Zr₅₅Ti₃Cu_30.5Al₁₀Ag_1.5 reaches 5.49%, which is 120% higher compared to the initial system. The addition of Ag may create local heterogeneity in the microstructure, allowing many secondary shear bands to appear during the expansion of the primary shear band, which increases the plasticity of the BMG. Electrochemical corrosion behavior analysis showed that the addition of appropriate Ag reduced the corrosion current density and increased the self-corrosion potential of Zr₅₅Ti₃Cu_{32 - x} Al₁₀Ag _x BMG. Moreover, Ag enhanced the biocorrosion resistance of Zr₅₅Ti₃Cu_{32 - x} Al₁₀Ag _x BMG in simulated body fluid and phosphate-buffered saline. Therefore, the new Zr-Ti-Cu-Al-Ag BMG system has shown great application potential as a biomedical material.