APPLICATION OF VIBRATIONAL PARAMETERS TO LOCATE THE SOLID-LIQUID INTERFACE DURING SOLIDIFICATION AND MELTING OF METALS

A method to locate the solid/liquid interface with vibrational paramet ers during solidification is proposed for the first time. The sufficie nt difference in resistance to shear stresses between liquid and solid phases of metals and alloys permits the application of vibrational pa rameters to locate the interface in real time and in a situation durin g solidification. Based on the solidification theory, continuum mechan ics, vibrational modal analysis and sensitivity analysis, the mechanic al model and the dynamic equations of a typical Bridgman solidifying s ystem have been established, the sensitivity of eigenvalues of the Bri dgman system to the location of the solid/liquid interface has been de rived, and the formulae concerned calculated. The experimental results are in good agreement with the computed ones.