Thermodynamic evaluation of the Cu-Mg-Zr system

The thermodynamic evaluation of the Cu-Mg-Zr system is presented in this pa per. A literature survey was carried out first based on the most recent lit erature, which was scanned from the THERMET literature database. The evalua tion of the thermodynamic parameters was carried out using Thermo-Gale (ver sion H) software. The evaluation of the Cu-Mg-Zr system was carried out using the most recent experimental data from the literature and a set of DTA measurements. DTA m easurements were done using alumina (Al2O3) crucibles under helium atmosphe re with the niobium (Nb) reference crucible. The evaluated Cu-Mg-Zr phase d iagram fitted well with experimental data with the liquidus data in a limit ed range of composition. There were two miscibility gaps observed in the sy stem. New tau phase was detected using the X-ray and microscopic analysis a nd the data was used in this evaluation. (C) 1999 Elsevier Science S.A. All rights reserved.