부산대학교 도서관

This paper describes the crystallographic features of a platelet-shaped precipitate that forms in the early stage of age hardening of Mg alloys containing rare-earth elements in the Ce subgroup. Transmission electron microscopy combined with computer simulation revealed that the precipitate, the habit plane of which is a {1100} matrix prism plane, is morphologically analogous to Guinier-Preston zones in Al-Cu alloys, that is two dimensional, but possesses an ordered structure based on the D0[sub 19] superlattice. The precipitate also contains periodically arranged atomic steps that are similar to antiphase boundaries in ordered alloys. These periodic steps result in a split of superlattice reflections similar to that observed in diffraction patterns obtained from a long-period superlattice such as CuAu II. [ABSTRACT FROM AUTHOR]