High-Entropy Alloys in Hexagonal Close-Packed Structure

• DOI: 10.1007/s11661-015-3091-1
• Publication Date: 2015-08-27T16:44:36Z
• Authors: M. C. Gao; B. Zhang; S. M. Guo; J. W. Qiao; J. A. Hawk
• Keywords: CALPHAD; High-Entropy Alloys; Cubic crystal system

The microstructures and properties of high-entropy alloys (HEAs) based on the face-centered cubic and body-centered cubic structures have been studied extensively in the literature, but reports on HEAs in the hexagonal close-packed (HCP) structure are very limited. Using an efficient strategy in combining phase diagram inspection, CALPHAD modeling, and ab initio molecular dynamics simulations, a variety of new compositions are suggested that may hold great potentials in forming single-phase HCP HEAs that comprise rare earth elements and transition metals, respectively. Experimental verification was carried out on CoFeReRu and CoReRuV using X-ray diffraction, scanning electron microscopy, and energy dispersion spectroscopy.