Structural analysis of molten Fe-Si alloys by X-ray diffraction.

概要

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Detailed measurements of X-ray diffraction on molten Fe-Si alloy, one of the fundamental systems in iron- and steelmaking, have been carried out over the whole concentration range at about 10 at% Si intervals at temperatures 50°C above the liquidus.The total interference functions a(K) and the radial distribution functions 4πr2ρ0 g(r) were estimated, from which the position K1, the height a(K1) and the half width W of the first peak of a(K), and the nearest neighbour distance r1 and the coordination number n1 were also obtained. The partial interference functions aFeFe(K) and aSiSi(K) were estimated at 30 at% Si by a concentration method.It was found that in the concentration range up to 40 at% Si, the overall feature of a(K) and g(r), together with K1, a(K1), W, r1 and n1 is almost similar to that of molten Fe. While for the alloys in the concentration range beyond 50 at% Si, with increasing Si content, the first peak of a(K) becomes broader and more asymmetric, the first peak of g(r) becomes narrower and the subsequent peaks are more strongly damped, and n1 decreases.From these facts, it was deduced that the structure of molten Fe-Si alloys is nearly close-packed in the range up to 40 at% Si, and then gradually changes to be more open, lower-coordinated with increasing Si concentration. The comparison of these results with other properties closely related to the liquid structure was also made.
The Iron and Steel Institute of Japanの論文