摘要
The thermal stability and glass forming ability (GFA) of Zr35-xTi30Cu7.5Be27.5Agx (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 Zr35Ti30Cu7.5Be27.5 alloy to 20 mm in the Zr34Ti30Cu7.5Be27.5Ag1 alloy. However, with the addition of more Ag the supercooled liquid region (△Tx) and y parameter (defined as Tx/(Tg+Tl)) 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 Zr35-xTi30Cu7.5Be27.5Agx alloys.
The thermal stability and glass forming ability （GFA） of Zr35-xTi3oCu7.sBe27.sAgx （x = 0-10） alloys were studied by X-ray diffrac- tion （XRD）, differential scanning calorimetry （DSC） and ultrasonic techniques. We found that the addition of 1 at.% Ag can con- siderably enhance the GFA as indicated by an increase in the critical glass dimension from 15 rnm in the Zr35Ti30CuT.sBe27.5 alloy to 20 mm in the Zr34Ti30Cu7.sBe27.sAgl alloy. However, with the addition of more Ag the supercooled liquid region （ATx） and y parameter （defined as Tx/（Tg＋TO） drastically decreased from 155 K and 0.436 to 76 K and 0.363, respectively, resulting in a de- crease 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 Zr35-xTi30Cu7.sBe27.sAgx alloys.
基金
supported by the National Natural Science Foundation of China (50731005, 50821001 and 51171163)
the National Basic Research Program of China (2010CB731600)
the Hebei Natural Science Foundation (E2010001176)
the Doctoral Fund of Ministry of Education of China (20101333110004)
