Conferences

Mechanical Properties and Formation of Phases in High-Entropy CrFeNiCuCoAlх Alloys

 
O.M.Myslyvchenko,
 
E. S.Makarenko,
   

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2015, #05/06
http://www.materials.kiev.ua/article/1952

Abstract

In this study, the CrFeNiCuCoAlх (where x = 0, 0.5, 1, 2, 3) multicomponent alloys were prepared by vacuum arc melting and their phase composition, microstructure and mechanical properties were examined. According to X-Ray analysis data, phase composition of alloys depending on Al content. It was found that the structure is changed from mixture FCC1+FCC2 solid solutions into BCC solid solution with the increase of Al content (at x = 3). Microstructure and chemical composition of dendritic and interdendritic regions were investigated by using scanning electron microscopy. The composition of primary and secondary dendrites includes all elements alloy. Interdendritic region has a high content of Cu due to its high positive enthalpy of mixing in pairs with most elements of the alloy. Microhardness increases from 3.1 to 8.4 GPa with increasing concentration of Al in the system CrFeNiCuCoAlх.


HIGH-ENTROPY ALLOY, MICROHARDNESS, SOLID SOLUTION, X-RAY DIFFRACTION ANALYSIS