The thermal stability and glass forming ability (GFA) of Zr 35−x Ti 30 Cu 7.5 Be 27.5 Ag x (x = 0-10) alloys were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and ultrasonic techniques. We found that the addition of 1 at.% Ag can considerably enhance the GFA as indicated by an increase in the critical glass dimension from 15 mm in the Zr 35 Ti 30 Cu 7.5 Be 27.5 alloy to 20 mm in the Zr 34 Ti 30 Cu 7.5 Be 27.5 Ag 1 alloy. However, with the addition of more Ag the

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... percooled liquid region (T x ) and  parameter (defined as T x /(T g +T l )) drastically decreased from 155 K and 0.436 to 76 K and 0.363, respectively, resulting in a decrease in the GFA. Additionally, the elastic constant (the ratio of shear modulus to bulk modulus or Poisson's ratio) was also used as a gauge to evaluate the GFA in Zr 35−x Ti 30 Cu 7.5 Be 27.5 Ag x alloys. bulk metallic glasses, glass forming ability, thermal stability, elastic properties Citation: Zong H T, Zhang X Y, Li L X, et al. Effect of Ag addition on the thermal stability and glass-forming ability of Zr 35 Ti 30 Cu 7.5 Be 27.5 bulk metallic glass.