Publication details

Study and Modelling of Phase Equilibria in Ni-Al-W System

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Year of publication 2003
Type Article in Proceedings
Conference CALPHAD XXXII (La Malbaine)
MU Faculty or unit

Faculty of Science

Field Physical chemistry and theoretical chemistry
Keywords CALPHAD; Phase Equilibrium; Modelling; Experiment
Description Multicomponent Ni-based alloys have been under intense development during last decades, as they represent a class of technically important materials for high temperature applications. The coexistence of a disordered matrix gamma and cuboidal domains of its ordered modification gamma' is a key feature controlling the mechanical properties of Ni-based superalloys. To design materials with long-term microstructural stability at elevated temperatures a good knowledge of equilibrium phase diagrams is of high importance. In recent years, the quaternary system Ni-Al-Cr-W has been systematically investigated and new experimental phase data have been obtained. The comparison of new experimental data with theoretical calculations and with other phase data obtained previously shows that thermodynamic re-evaluation of lower order subsystem Ni-Al-W is necessary.
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