Abstract
Thermophysical properties of undercooled liquid monotectic alloys areusually difficult to be determined because of the great difficulty inachieving large undercoolings. We measure the surface tension of liquidFe77.5Cu13Mo9.5 monotectic alloy by anelectromagnetic oscillating drop method over a wide temperature rangefrom 1577 to 1784 K, including both superheated and undercooled states.A good linear relationship exists between the surface tension andtemperature. The surface tension value is 1.588 N/m at themonotectic temperature of 1703 K, and its temperature coefficient is−3.7×10−4 Nm−1K−1. Based on the Butler equation, thesurface tension is also calculated theoretically. The experimental andcalculated results indicate that the effect of the enriched element ondroplet surface is much more conspicuous than the other elements todecrease the surface tension.
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