The Constitution of Alloys and Phase Diagram of the Ternary Al–Cr–Pt System at 50–100 at.% Pt. II. Melting Diagram of the Al–Cr–Pt System at 50–100 AT.% Pt

Abstract

Previous data on the constitution of the solidus surface in the Al–Cr–Pt system at 0–100 at.% Pt and results from study of the associated cast alloys are used for metallurgical, X-ray diffraction, electron microprobe, and differential thermal analyses to construct the liquidus surface on the composition triangle and analyze the alloy solidification processes. This has allowed the construction of the Al–Cr–Pt melting diagram in the composition range 50–100 at.% Pt for the first time. It is determined that the liquidus surface consists of six primary solidification fields of the platinum solid solution and phases based on binary and one ternary compounds. Four invariant four-phase equilibria involving the liquid phase (two eutectic and two transition equilibria) and three invariant threephase eutectic equilibria are found in the system.