| 摘要 |
<p>The invention is a method for verifying and improving the quality of a metal alloy during the solidification process, including, in the given order, the operations of: placing the metal alloy in the liquid state inside a crucible; providing a first constant electrical quantity, selected between electrical current and electrical voltage, between a first pair of electrodes immersed in said metal alloy during the solidification stage; measuring the values of a second electrical quantity, selected between electrical voltage and electrical current, for a plurality of instants during the solidification stage, by means of a second pair of electrodes immersed in the metal alloy; calculating, for each instant, the electrical resistance of the metal alloy obtained from the ratio between the first constant electrical quantity and each one of the values of the second electrical quantity; defining a real curve of the electrical resistance variation in the metal alloy during the solidification stage on a Cartesian graph where temperature and/or time values are indicated on the x-axis and electrical resistance values are indicated on the y-axis; comparing the real curve with reference values related to the resistance variation obtained from a plurality of statistical measurements on samples of the metal alloy whose defectiveness level is known, in such a way as to identify any dissimilarities of the real curve with respect to said reference values; including additives in the metal alloy in order to reduce the dissimilarities between the real curve and the reference values.</p> |
