Constitutional Diagram of Ternary Fe-Ca-Si Alloys

概要

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Microstructural observations, thermal analyses, chemical analyses and X-ray diffractions have been made of the alloys melted with arc or high-frequency induction in argon atmosphere, the compositions of which lie in the field of two-liquid immiscibility and one-liquid phase. The results may be summarized as follows : With increasing content of silicon or of aluminium, the miscible gap of the field of the Fe (Mn)-Ca system became narrow and had a critical point at nearly 33% Fe (Mn)-33%Ca-34%Si(Al), at which the two-liquid phase became indistinguishable. Above 35% silicon or aluminium content, only one liquid solution existed over the entire composition range of the alloy system. It was assumed that a quasi-binary eutectic point should appear in the vicinity of 23%Fe-38.5%Ca-38.5%Si for a quasi-binary system existing between the binary intermediate compounds CaSi and FeSi. Freezing of alloys involving ternary three-phase equilibrium was completed at 1030℃ and the composition of this ternary non-variant point lay upon 5%Fe-35%Ca-60%Si. In the field of only one liquid solution there were four primary phase regions of Si, CaSi, FeSi and FeSi_2. As morphological features, Si appeared in rectangular form, FeSi in dendritic or spherical form, and CaSi and FeSi_2 in band or plate-like form.
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