THE INFLUENCE OF COOL1NG RATE ON THE FORMAT1ON OF AN AMORPHOUS PHASE IN Si-BASED MULTICOMPONENT ALLOYS AND ITS THERMAL STABILITY

摘要

By adding Ni, Cr, and Zr to the Si-Al-Fe system and using a higher surface velocity of the copper wheel of 63 m/s, the composition range of an amor- phous single phase was extended to 60 at/100 Si. An amorphous Si_60Al_18Fe_12Ni_4Cr_2Zr_3 alloy was produced. The amorphous phase in the Si-Al-TM (TM = transition metals) alloys shows higher thermal stability than in the Al-Si-TM alloys. By the shift of differential scanning calorimetry (DSC) peaks with change of heating rate, the activation energy for the transformation was determined to be 343 kJ/mol for Si_55Al_20Fe_10Ni_5Cr_5Zr_5 alloy and 374 kJ/mol for Si_50Al_25Fe_10Ni_5Cr_5Zr_5 alloy.