Formation of B2 antiphase domains in rapidly solidified Fe-Al alloys

Abstract

Abstract Fe-Al-X (X = Cr, Mo) alloys in the composition range 50 to 80 at.% Fe, 0 to 20 at.% X were rapidly solidified by chill-block melt-spinning. Thin foil transmission electron microscopy of the rapidly solidified ribbons revealed that antiphase domains occur in the B2 structure in the limited composition range 22 to 37 at.% Al. The B2 antiphase domain size was found to increase with the increasing Al-content of the ribbon. The criterion for antiphase domain (APD) formation is investigated in terms of mechanisms for formation of the B2 structure.