Dual-phase high-entropy alloys for high-temperature structural applications

Abstract

The dual-phase AlCoCrFeNi alloy exhibits excellent specific strength in the 773–873 K temperature range. However, the phase transformation taking place above 773 K hinders its structural use at higher temperatures. In the present study, the temperature dependence of the specific strength of the AlCoCrFeNi alloy has been examined from a microstructural point of view. One of the key findings of this work is that the high-temperature phase stability of the dual-phase alloy is strongly affected by its microstructural morphology; this finding provides new insights into the application of high-entropy alloys as high-temperature structural materials, for instance in aerospace engine components.