The disordering and posterior reordering processes of a B2 Fe-40Al at% alloy induced by ball milling and subsequent annealing have been studied from magnetic and structural points of view. The ball milling process involves several steps: loss of long range order, reduced crystallite size, induced microstrains, loss of short range order and lattice expansion. These structural changes induce a transition from a paramagnetic to a ferromagnetic state, which can be observed in the different magnetic parameters studied. The thermal reordering process of the ball-milled alloy has two distinct stages: anneal out of antisite defects and recrystallization. From the magnetic behavior of these stages, the contribution of the grain and grain boundaries to the total magnetization at room temperature has been evaluated, this allows us to estimate the grain boundary thickness in these samples.
|Journal||Materials Science Forum|
|Publication status||Published - 1 Jan 1999|