Magnetic and structural properties of the Supermalloy powders produced by mechanical alloying and annealing

Nanocrystalline Supermalloy powders were obtained by mechanical alloying under argon atmosphere and subsequent annealing. Several milling times have been used and a heat treatment has been performed in order to Is improve the solid-state reaction and remove the internal stresses. The evolution of the Supermalloy formation by mechanical alloying and annealing was confirmed by X-ray diffraction and magnetic measurements. A minimum in the spontaneous magnetisation vs. milling time shows the presence of different processes in the Supermalloy formation by milling. © 2004 Published by Elsevier B.V.