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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 6    December 2004

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Model on medium range order in liquid 
Al-Fe alloys
QIN Jing-yu(秦敬玉), QIN Xu-bo(秦绪波), 
WANG Wei-min(王伟民), BIAN Xiufang(边秀房) 

Key Laboratory of Liquid Structure and Heredity of Materials,
 Ministry of Education, Shandong University, Ji′nan 250061, China

Abstract: Numerical analysis confirms that in some cases the prepeak in the structure factor causes obvious change in the coordination number, but change in the interatomic distance can be neglected for the study of the medium range order(MRO). In order to model the MRO, it is not possible to get enough information based on the pair correlation function; however the quasi-Bragg equation can be employed to characterize the quasi-period of MRO corresponding to the prepeak position. By assuming that the interatomic distance between Fe and Al atoms hardly varies with composition, structural models were constructed based on the B2-type structure units of ordered FeAl alloy. The quasi-periods for different alloys obtained from the model structures are in reasonable agreement with the experimental ones.

 

Key words:  Al-Fe alloy; molten structure; medium range order

ISSN 1672-7029
CN 43-1423/U

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