Amorphous forming ranges of Al-Fe-Nd-Zr system predicted by Miedema and geometrical models  

作　　者：张雷 陈红梅 欧阳义芳 杜勇 

机构地区：[1]Department of Mathematics and Computer,Guangxi College of Education [2]College of Physical Science and Technology,Guangxi University [3]State Key Laboratory of Powder Metallurgy,Central South University

出　　处：《Journal of Rare Earths》2014年第4期343-351,共9页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(51061004);Science Foundation of Guangxi Education Department(2013YB377)

摘　　要：A method based on the semi-empirical Miedema model and a geometrical model was used to study the glass forming abili-ties （GFA） and the amorphous forming ranges of Al-Fe-Nd-Zr system and its constituent ternary systems. The amorphous forming composition ranges were analyzed based on different criteria such asΔGam-ss and PHSS （PHSS=ΔHchem （ΔSC/R）（ΔSσ/R）） for Al-Fe-Nd system. The predicted amorphous forming range was in good agreement with the experimental results. The results showed that the criterion ofΔGam-ss was more accurate, and agreed well with the experiment results. The Gibbs free energy differenceΔGam-ss and pa-rameter PHSS were then used to predict the amorphous forming composition range for the rest of the constitutive ternary systems of Al-Fe-Nd-Zr. In addition, the amorphous forming composition ranges of the （Al-Fe-Zr）100-xNdx （x=50, 60, 70） systems were predicted byΔGam-ss and the modified parameter PHSS. The Gibbs free energy of Al10（Fe1-xZrx）30Nd60 were also calculated. The GFA parameter PHSS indicated that the composition with the highest GFA was Al33.5Fe13.5Zr3Nd50 for the （Al-Fe-Zr）50Nd50 system, Al28.8Fe10Zr1.2Nd60 for the （Al-Fe-Zr）40Nd60 system and Al22.8Fe6.9Zr0.3Nd70 for the （Al-Fe-Zr）30Nd70 system, and the results suggested that those alloys with high content of Al had higher GFA. The appropriate content of neodymium and zirconium resulted in the lower value of PHSS and increased the GFA obviously.A method based on the semi-empirical Miedema model and a geometrical model was used to study the glass forming abili-ties （GFA） and the amorphous forming ranges of Al-Fe-Nd-Zr system and its constituent ternary systems. The amorphous forming composition ranges were analyzed based on different criteria such asΔGam-ss and PHSS （PHSS=ΔHchem （ΔSC/R）（ΔSσ/R）） for Al-Fe-Nd system. The predicted amorphous forming range was in good agreement with the experimental results. The results showed that the criterion ofΔGam-ss was more accurate, and agreed well with the experiment results. The Gibbs free energy differenceΔGam-ss and pa-rameter PHSS were then used to predict the amorphous forming composition range for the rest of the constitutive ternary systems of Al-Fe-Nd-Zr. In addition, the amorphous forming composition ranges of the （Al-Fe-Zr）100-xNdx （x=50, 60, 70） systems were predicted byΔGam-ss and the modified parameter PHSS. The Gibbs free energy of Al10（Fe1-xZrx）30Nd60 were also calculated. The GFA parameter PHSS indicated that the composition with the highest GFA was Al33.5Fe13.5Zr3Nd50 for the （Al-Fe-Zr）50Nd50 system, Al28.8Fe10Zr1.2Nd60 for the （Al-Fe-Zr）40Nd60 system and Al22.8Fe6.9Zr0.3Nd70 for the （Al-Fe-Zr）30Nd70 system, and the results suggested that those alloys with high content of Al had higher GFA. The appropriate content of neodymium and zirconium resulted in the lower value of PHSS and increased the GFA obviously.

关 键 词：Al-Fe-Nd-Zr alloy amorphous forming range Miedema model glass forming ability parameter rare earths 

分 类 号：TG139.8[一般工业技术—材料科学与工程]