PHASE-TRANSITION AND MAGNETIC-PROPERTIES OF SUPERCOOLED AL-GE-TM (TM = CR, FE, CO) ALLOYS

Formation criteria and magnetic properties of rapidly solidified Al-Ge -TM (TM=Cr, Fe and Co) alloys were examined. The phase changes from am orphous, icosahedral, and decagonal, to approximant crystalline, corre sponding to TM as Cr (Ge rich), Cr, Fe and Co, respectively, in the ra pidly solidified AI-Ge-TM alloys. Thermomagnetic curves indicate that for the systematically variation of the magnetic ordered phases, Al40G e40Cr20 amorphous, Al60Ge20Cr20 icosahedral, Al50Ge20Fe30 decagonal an d Al60Ge10Co30 approximant crystalline alloys were identified to be of ferromagnetism, mictomagnetism, Curie-Weiss paramagnetism and Pauli p aramagnetism, respectively.