Secondary-Ion Emission of High-Entropy Cr14,3Mn14,3Fe14,3Ni28,6Co14,3Cu14,3 Alloy.

  
M.A.Vasiliev,
 
S.I.Sidorenko,
 
S.M.Voloshko
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2016, #07/08
http://www.materials.kiev.ua/article/2223

Abstract

To understand the nature of the unique mechanical properties of high-entropy alloys, it is important to know the nature and strength of interatomic interactions between homogeneous and heterogeneous atoms. In this regard, the objective of this study is to use the phenomenon of secondary-ion emission to solve this problem for alloy Cr14,3Mn14,3Fe14,3Ni28,6Co14,3Cu14,3 with fcc structure. The yield of secondary ions for all alloy components and corresponding pure metals is quantitatively compared for the first time and an equation is proposed to calculate the atomic binding energy based on the existing models of secondary-ion emission mechanism. Compared to pure metals, the binding energy increases in the alloy for Cr and Fe atoms. The greatest decrease in the binding energy is observed for Mn atoms. Reduction in the binding energy for Co and Ni is insignificant. It is suggested that the atomic interaction energy is influenced by changes in the local electronic density in fusion as compared with pure metals.


ATOMIC STRUCTURE, BINDING ENERGY, HIGH-ENTROPY ALLOY, INTERATOMIC INTERACTION, SECONDARY-ION EMISSION