Regensburg 2019 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 8: Topical session (Symposium MM): High entropy and compositionally complex alloys

MM 8.2: Vortrag

Montag, 1. April 2019, 16:15–16:30, H43

The elastic-strain energy stability criterion for complex concentrated alloys — •Angelo F Andreoli1, Jiri Orava1, Peter K Liaw2, Hans Weber1, Marcelo F de Oliveira3, Kornelius Nielsch4, and Ivan Kaban11IFW Dresden, Institute for Complex Materials, Helmholtzstr. 20, 01069 Dresden, Germany — 2Materials Science and Engineering Department, The University of Tennessee, 414 Ferris Hall, Knoxville, TN 37996, USA — 3Materials Science and Engineering Department, University of São Paulo, Avenida João Dagnone 1100, CEP 13563-120, São Carlos, SP, Brazil — 4IFW Dresden, Institute for Metallic Materials, Helmholtzstr. 20, 01069 Dresden, Germany

An empirical method is developed, based on the calculated theoretical elastic-strain energy, to predict the phase formation and its stability for complex concentrated alloys. The method prediction quality is compared with the traditional empirical rules based on atomic-size mismatch, enthalpy of mixing and valence electron concentration for a database of 235 different alloys. Considering the different available empirical methods used to date, the *elastic-strain energy vs. valence electron concentration* criterion shows an improved ability to distinguish between single-phase solid solutions, mixtures of solid solutions and intermetallic phases. The criterion is especially strong for alloys that precipitate the mu phase. The theoretical elastic-strain-energy parameter can be combined with other known parameters, such as those noted above, to establish new criteria which can help predicting the design of novel high-entropy alloys with on-demand combination of mechanical properties.

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