Formation of a hexagonal closed-packed phase in Al0.5CoCrFeNi high entropy alloy

Abstract

Abstract

Fast mechanical synthesis, structure evolution, and thermal stability of nanostructured CoCrFeNiCu high entropy alloy

“…Besides promising properties of HEAs caused by their multiphase microstructure, the most important parameter for their potential applications is their thermal stability. It has been found that the phase evolution during heat treatment largely depends on such factors as alloy composition, concentration of the elements, and synthesis route [16][17][18][19][20].…”

An Experimental and Theoretical Study of Duplex fcc+hcp Cobalt Based Entropic Alloys

“…Moreover, for a long time high entropy alloys have been believed to form primarily bcc and/or fcc phases. The hcp phase has only been recently observed in CoCrFeMnNi [33], AlHfScTiZr [34], Al 0.5 CoCrFeNi [35] and CoCrFeNi [36]. Here we study derivatives of the CoCrFeMnNi system where the hcp and fcc phases co-exist.…”

Thermal–Mechanical Processing and Strengthen in AlxCoCrFeNi High-Entropy Alloys

“…Grain coarsening occurred after heat treatment at 850°C, and the fine bcc phase emerged and distributed uniformly in the matrix, as seen in Figure 1 ( Wang et al, 2017a). Another study reported the precipitation of a plate-like hexagonal closed-packed phase with high cobalt content located at the interdendritic region of the Al 0.5 CoCrFeNi HEA after 650°C/8 h heat-treatment (Wang et al, 2017b). Though a simple shear, the bcc phase could transform into the hcp phase, and the crystal orientation relationship between these two phases has also been to been established as [11][12][13][14][15][16][17][18][19][20] hcp || [111] bcc (000-1) hcp || (10-1) bcc .…”