摘要
采用基于Miedema理论的半经验模型计算了Gd-Fe-Al三元合金系统中非晶相、固溶体相以及化合物相的吉布斯自由能,预测该合金系统的非晶形成范围和非晶形成能力.计算结果显示:实验得到的Gd基大块非晶在预测的非晶形成范围内;Gd基合金Gd65Fe20Al15,Gd65Fe15Al20和Gd70Fe15Al15的非晶形成能力与实验结果符合得很好.但是,由于共晶点位置的影响,Al基合金的非晶形成范围和非晶形成能力均与预测结果有一定差距.非晶相与固溶体相之间吉布斯自由能差是影响非晶形成的重要因素.
Gibbs free energy of amorphous alloys, solid solutions and compounds in the Gd- Fe- Al ternary system were calculated with a semi-empirical model based on Miedema＇ s theory to predict the glass-forming range （GFR） and the glass-forming ability （GFA） of this system. It has been found that Gd-based bulk metallic glasses （BMGs） well locate in the predicted GFR; and the predicted GFA is in good agreement with experiments for Gd-based alloys Gd65Fe20Al15,Gd65Fe15Al20 and Gd70Fe15Al15 . However, the predicted GFR and GFA of Albased alloys do not agree well with experiments due to its unique position of eutectic point. The Gibbs free energy difference between amorphous and solid solution has an important effect on glass formation.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第2期62-65,共4页
Journal of Hunan University:Natural Sciences
基金
教育部博士点青年教师基金资助项目(20070532016)
关键词
金属玻璃
吉布斯自由能
非晶形成范围
非晶形成能力
metallic glass
Gibbs free energy
glass-forming range（GFR）
glass-forming ability（GFA）
作者简介
张爱龙（1975-），男，湖南桃源人，湖南大学博士研究生.
通讯联系人，E-mail：ma97chen@hotmedl．com
