A STUDY OF THE SI-RICH DOMAIN OF THE AL-CA-FE-SI QUATERNARY SYSTEM

Different phases appear in the elaboration of metallurgical grade sili con containing impurities such as Fe, Ca or Al. In this contribution, an attempt is made to correlate the observed phases in industrial allo ys with results from a thermodynamic calculation of the quaternary sys tem Al - Ca - Fe - Si in the Si - rich corner. In addition, differenti al thermal analyses as well as X - ray diffraction were performed on s elected compositons of quaternary alloys, the results of which are dis cussed with the predicted phase diagram.