A New Method to Measure Solid Fraction of Mushy/Semi-Solid Metals and Alloys

摘要

A new method for measuring solid fractions in mushy (and/or mashy) or semisolid metals and alloys is proposed. First, the relationship between electric resistance (or electric potential difference) and temperature from the solidus-line to the liquidus-line are measured for binary alloys and multicomponent alloys. Then, the solid fraction quantity in a given binary alloys in the range where solid and liquid phases coexist is determined from its respective equilibrium phase diagram. Finally, by combining the two results, a general relationship between normalized electric potential difference and solid fraction is obtained for all of the binary alloys tested. This value is used to determine the solid fractions of multicomponent alloys from their measured normalized electric potential differences. The determined values are verified using the rapid solidification method.