Morphology of Voids in Quenched β-Brass

Abstract

The shape of voids in quenched β-brass has been studied by means of transmission electron microscopy. A variety of void shape is found, while the void image calculated by using the two-beam dynamical theory can verify that the fundamental shape is a rhombic dodecahedron with the {110} faces. The variety is arisen from two factors. One is truncation of the ⟨100⟩ corners of voids and the other is deformation from the rhombic dodecahedron. From the truncation, the anisotropy of surface energy of β-brass can be estimated to be γ¹⁰⁰⁄γ¹¹⁰≥1.24. The deformation is due to void growth associated with the formation of antiphase boundaries.