Mossbauer and TEM study of Fe-Cr powders elaborated by mechanical alloying

A Cr80Fe20 alloy was elaborated by mechanical alloying, in a planetary mill , from powder mixture of elemental Fe and Cr. Mossbauer spectrometry was pe rformed to follow the formation of the alloy which is paramagnetic at 300 K . The weight of the magnetic contribution due to the uncompletely alloyed a lpha-Fe, decreases linearly with the milling time. Powder particle microstr ucture was studied by TEM. The micrometer particles consist of nanocrystall ine grains of about 5-15 nm. After 12 h of milling, the Cr80Fe20 alloy seem s to be highly disordered than after 3 h. (C) 1999 Elsevier Science. B.V. A ll rights reserved.