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| STUDY OF THE STRUCTURE OF MOLTEN Fe--Si ALLOYS BY X--RAY DIFFRACTION |
| QIN Jingyu; GU Tingkun; TIAN Xuelei; BIAN Xiufang |
| The Key Laboratory of Liquid Structure and Heredity of Materials; Ministry of Education; Shandong University; Jinan 250061 |
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Cite this article:
QIN Jingyu; GU Tingkun; TIAN Xuelei; BIAN Xiufang. STUDY OF THE STRUCTURE OF MOLTEN Fe--Si ALLOYS BY X--RAY DIFFRACTION. Acta Metall Sin, 2004, 40(7): 689-693 .
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Abstract The structures of 14 molten Fe--Si alloys were studied at 1550℃ by a
theta--theta X--ray diffractometor. The alloys with a
composition interval of about 10%Si (atomic fraction) including some intermetallic compounds.
The analysis on the experimental data employed the following
parameters: the height, position and half--width of the
first peak of the structure factor, the first
peak position of the pair correlation function,
the first peak shape of the radial distribution
function and the coordination number etc.. The
results show that the structure behavior of
molten Fe--Si alloys along the whole composition range
could be divided into four intervals which
are indicated by 5 borders of Fe,
Fe0.754Si0.246, Fe0.50Si0.50,
Fe0.282Si0.718 and pure Si.
Distinct structural change was observed
across the borders. The liquid structure of Fe0.50Si0.50 alloy inherited the structure of intermetallic compound FeSi to some
extent. Covalent bonding between Si--Si atoms was speculated to exist in alloys with Si content higher than 50.0%.
Furthermore, the existence of prepeak in the structure factors
of some Fe--Si alloys marked the
medium--range order in such alloys.
Some models and results by other researchers were also
discussed.
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Received: 15 July 2003
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