New Fe-Ni based metal-metaloid glassy alloys prepared by mechanical alloying and rapid solidification

摘要

Mechanical alloying and rapid solidification are two impoortant routes to obtain glassy alloys. New Fe-Ni based metal-metalloid (P-Si) alloys prepared by these two different processing routes were studied by differential scannign calorimetry and transmission Mossbauer spectroscopy. Mechanical alloyed samples were prepared with elemental precursors, and different nominal compositions. Rapidly solidified alloys were obtained by melt-spinning. The structural analyses show that, independent of the composition, the materials obtainedby mechanical alloying are not completely disordered whereas fully amorphous alloys were obtaine dby rapid solidification. Consequently, the thermal stability of mechanically alloyed samples is lower than that of the analogous material prepared by rapid solidification. The P/Si ratio controls the magnetic interaction of the glassy ribbons obtained by rapid solidification. The experimental results are discussed in terms of the degree of amorphization and crystallization versus processing route and P/Si ratio content.