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Published online by Cambridge University Press: 26 February 2011
Atomic structure of [001] tilt boundaries in an ordered A3 B compound with Ll2 structure has been studied using model pair-potentials Ko describe atomic interactions. The structural features related to the ordering tendency as well as structural changes associated with deviations away from stoichiometry have been investigated. The differences between boundary structures in pure metals and compounds have been found to be most pronounced when the stoichiometry is preserved at the boundary. Possible significance of these structural aspects for understanding very different fracture behavior of pure f.c.c. metals and L12 compounds is discussed.