HREM OBSERVATION OF GROWN-IN ANTIPHASE BOUNDARIES IN AN FE3AL BASED ALLOY

Atomic arrangements of grown-in antiphase boundaries (APBs) in Fe3Al b ased alloy were observed by means of high resolution electron microsco py. According to the continuity of Fe and Al sublattices across the AP Bs in different crystallographic planes, all observed APBs were identi fied as next-nearest neighbour types. When observed edge-on, the grown -in APBs are very thin. The comparison of the contrast of the atomic c olumns in the close vicinity of the APBs and the interior of the domai ns indicates sharp, un-relaxed grown-in domain walls. (C) 1996. Publis hed by Elsevier Science Limited.