Experimental determination of effective atomic radii of constituent elements in CrMnFeCoNi high-entropy alloy

Abstract

To elucidate the complex mechanism of solid-solution strengthening in high entropy alloys (HEAs), it is necessary to determine the effective atomic radii of the constituent elements that are the sources of lattice strain. In the present study, the effective atomic radii of the constituent elements in CrMnFeCoNi HEA which is the basis of the atomic displacement are evaluated from the lattice parameters experimentally determined via θ-2θ X-ray diffraction measurements. The order of the evaluated atomic radii in the present study is different from that of the atomic radii determined via ab-initio calculations in previous studies. The results of the ab-initio calculations indicate a correlation between the yield stress of and the average atomic displacement in the HEA. However, no definite correlation is confirmed by the experimental results in the present study.

Study on tribological properties of high entropy alloy composite coatings with different tungsten carbide contents in laser cladding

“…High entropy alloys have more constituent elements, and it is more difficult for each element to diffuse at the same rate. The atomic radius size of the high entropy alloy varies widely, and its internal structure is also more complex, which is easy to produce nanoscale precipitation particles with amorphous phase during the solidification of the alloy and improve the strength of the alloy 23 . As Table 2 shows the enthalpy of mixing of binary alloys in HEA composite coatings.…”