Crystallography of Antiphase Boundaries in Fe-Si Alloys

Publisher Website
Google Scholar
Abstract
Antiphase domain boundaries in alloys with 11.2 to 15.4 at% Si are studied by electron microscopy. It is found that the boundaries of the types 1/4 α 〈111〉 and 1/2 α 〈100〉 in the DO3 structure have a pronounced crystallographic character and lie approximately on {100} planes. The FeSi alloys are essentially different in this respect from other alloys of the same structure. It can be further assumed on the basis of experiments that in the B2 structure region the boundaries of the type 1/4 α 〈111〉 have noncrystallographic character. The behavior of the boundaries in both structures is compared with existing theories, and it is found that for the DO3 structure a satisfactory explanation based on these theories is not possible. The reasons for the disagreement between theory and experiment are discussed and the previously observed deformation of the crystal lattice in the boundary is proposed as a possible explanation.