Coherent phase diagram of the AuCu---Pt section in the Au---Cu---Pt ternary system

Abstract

To determine the coherent phase diagram of the AuCu---Pt pseudobinary system, phase identification and analysis of microstructural configurations were performed, mainly by means of transmission electron microscopy and selected-area electron diffraction examination. Various regions were found in the present experimental coherent phase diagram: (1) α phase region (a single phase of f.c.c. disordered solid solution); (2) AuCu I (L10), f.c.t. ordered single-phase region; (3) long-period orthorhombic superstructure AuCu II (L10-s) single-phase region; (4) α + AuCu I region of two coexisting phases; (5) AuCu I + AuCu II region of two coexisting phases; (6) α + AuCu I + AuCu II region of three coexisting phases. Microstructural features of these regions were described related to phase transformations.