Magnetic properties and structure of nanocrystalline Fe-Al and Fe-Ni alloys

Magnetic and structural properties of nanocrystalline Fe-AE and Fe-Ni alloy s were investigated Alloys were prepared by the mechanical alloying process . The standard X-ray diffraction, Mossbauer and magnetic studies were carri ed out on the powder samples The structural investigations proved that in t he low-energy mechanical alloying process of Fe and Al the disordered bcc s olid solution was formed up to 50 at.% Al. Alloys were amorphous for Al con tent between 50 and 90 at.%. The final products of milling exhibited intere sting magnetic properties different as compared with microcrystalline alloy s. In the case of Fe-Ni alloys the bcc solid solution was formed during hig h-energy ball milling for the composition with 20 at.% Ni, while above 35 a t.% Ni the fee solid solutions were obtained All mechanically synthesized F e-Ni alloys were ferromagnetic and no Invar effect was observed for 35 at.% Ni. (C) 1999 Acta Metallurgica Inc.