Effects of Microalloying on Glass Forming Ability and Thermodynamic Fragility of Cu-Pr-Based Amorphous Alloys  

作　　者：李雪莲 边秀房 郭晶 赵岩 武玉琴 孙保安 

机构地区：[1]Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University

出　　处：《Journal of Rare Earths》2007年第5期615-618,共4页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (50471052);Natural Science Foundation of Shandong Province (Z2004F02)

摘　　要：The effects of microalloying of Ti and B on the glass formation of Cu60Pr30Ni10Al10-2xTixBx（x = 0, 0.05% （atom fraction）） amorphous alloys was investigated using differential scanning calorimetry （DSC） and X-ray diffraction （XRD）. XRD analysis showed that mieroalloying with 0.05% Ti and 0.05% B improved the glass forming ability （GFA）. The smaller difference in the Gibbs free energy between the liquid and crystalline states at the glass transition temperature （△G1-X（Tg）） and the smaller thermodynamic fragility index （△Sf/Tm, where ASf is the entropy of fusion, and Tm is the melting temperature） after mieroalloying correlated with the higher GFA.The effects of microalloying of Ti and B on the glass formation of Cu60Pr30Ni10Al10-2xTixBx（x = 0, 0.05% （atom fraction）） amorphous alloys was investigated using differential scanning calorimetry （DSC） and X-ray diffraction （XRD）. XRD analysis showed that mieroalloying with 0.05% Ti and 0.05% B improved the glass forming ability （GFA）. The smaller difference in the Gibbs free energy between the liquid and crystalline states at the glass transition temperature （△G1-X（Tg）） and the smaller thermodynamic fragility index （△Sf/Tm, where ASf is the entropy of fusion, and Tm is the melting temperature） after mieroalloying correlated with the higher GFA.

关 键 词：mieroalloying glass forming ability FRAGILITY difference in Gibbs free energy rare earths 

分 类 号：TG139.8[一般工业技术—材料科学与工程]