Thermodynamic Aspects of Nanostructured CoAl Intermetallic Compound during Mechanical Alloying

材料科学技术（英）, 2011, 27(7): 601-606.

Thermodynamic Aspects of Nanostructured CoAl Intermetallic Compound during Mechanical Alloying

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1.Department of Materials Engineering, Nanotechnology and Advanced Materials Institute, Isfahan University of Technology, 84156-83111, Iran

2.Department of Materials Engineering, Nanotechnology and Advanced Materials Institute, Isfahan University of Technology, 84156-83111, Iran

3.Department of Materials Engineering, Nanotechnology and Advanced Materials Institute, Isfahan University of Technology, 84156-83111, Iran

4.Department of Materials Engineering, Nanotechnology and Advanced Materials Institute, Isfahan University of Technology, 84156-83111, Iran

关键词：金属间化合物 , 机械合金化 , 热力学分析 , 煤炭生产 , 纳米结构 , 吉布斯自由能 , 最终产品 , 粉末混合物

Thermodynamic Aspects of Nanostructured CoAl Intermetallic Compound during Mechanical Alloying

Keywords： Intermetallics , CoAl , Nanostructured materials , Mechanical alloying , Thermodynamics ,

The nanostructured CoAl intermetallic compound was produced by mechanical alloying （MA） of the Co50Al50 elemental powder mixture in a planetary high energy ball mill. The ordered B2-CoAl structure with the grain size of about 6 nm was formed via a gradual reaction after 10 h of MA. A thermodynamic analysis of the process was also done. The results showed that the intermetallic compound of CoAl had the minimum Gibbs free energy compared to solid solution and amorphous states indicating the initial MA product was the most stable phase in the Co-Al system which was changed to a partially disordered structure with a steady long-range order of 0.82 at further milling. This amount of disordering caused the enthalpy of final product to show an increase of about 5.1 kJ·mol-1. Calculation of enthalpy related to the triple defect formation revealed that the enthalpy required for Al anti-sites formation was about 3 times greater than that for Co anti-sites formation.

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Thermodynamic Aspects of Nanostructured CoAl Intermetallic Compound during Mechanical Alloying

Thermodynamic Aspects of Nanostructured CoAl Intermetallic Compound during Mechanical Alloying

参考文献