Fe基、Zr基大块非晶合金粘度的热力学计算

Calculation of the Viscosity of Zr-and Fe-based Metallic Glass Alloys with Thermodynamics Method

利用熔点、玻璃化转变温度等易获得的参数并结合准规则模型以及生成热模型,给出了一种计算多元系非晶合金粘度的热力学方法。利用该方法计算了Zr基和Fe基大块非晶合金系的粘度,计算结果与经验结果吻合较好。计算表明,同一温度下,多组元合金系粘度值随组元数增加而增大,粘度随着过冷度的增加而增大;Zr-Al-Ni三元合金在xZr=0.375～0.8571、xNi=0～0.357成分范围内,Zr-Al-Cu三元合金在xZr=0.375～0.8625、xCu=0～0.400成分范围内,Zr66.7Al-Ni-Cu系在xAl=0.632～0.809、xNi=0.145～0.245成分范围内粘度较高;对Fe-基块体合金系,Fe-Nb-B合金系在xNb=0.325～0.9375、xB=0.0625～0.675成分范围内,Fe-Si-B合金在xSi=0～0.521、xB=0.5124～0.9375成分范围内粘度较高。

Based on quasiregular model and Miedema model, a new thermodynamics method to evaluate the viscosity of glass alloys was provided by using the easily obtained parameters Such as onset melting temperature, glass transition temperature and the cooling rate. With this model the viscosity of Zr- and Fe-based metallic glass alloys was calculated and the computed results agree well with the empirical one. The results show that, at a given temperature, viscosity increases with the addition of new component, and a higher viscosity will be obtained with the increase of the supercooling; to Zr-Al-Cu and Zr-Al-Ni, the highest viscosity locates in the composition range of XZr = 0. 375- 0. 8625, XCu = 0-0. 400 and XZr =0. 375-0. 8571, XNi = 0-0. 357, respectively, and to the Zr-Ni-Al-Cu system with 66. 67% Zr, the highest viscosity is obtained in the region of xAl= 0. 632-0. 809, XNi =0. 145-0. 245; Fe-Nb-B alloys have a higher viscosity in xNb = 0. 325-0. 9375, xB = 0. 0625-0. 675; for Fe-Si-B the favorite composition to form glass is in xsi= 0. 521, xB=0. 5124-0. 9375.