Comparative microstructural and corrosion development of VCrNiCoFeCu equiatomic multicomponent alloy produced by induction melting and spark plasma sintering

É Fazakas,A Heczel,B Varga,V Zadorozhnyy,D Molnár,Á Vida

doi:10.1088/1757-899x/329/1/012016

Abstract

The present study focuses on the corrosion behavior of a single-phase FCC high entropy alloy (VCrNiCoFeCu) casted by two different methods: induction melting and spark plasma sintering. The corrosion resistance has been evaluated using immersion tests in 3.5% NaCl solution, the potentiodynamic polarization measurements and the results are compared how is dependent the corrosion rate as a function of the production methods. Our results show that induction melted sample is stable in salty environment. On the other hand, based on the changes of polarization curves, there must be an evolution of oxide films on the SPSed sample until reaching the stable oxide layer.

Highlights

Traditional concept of alloy systems has been based on utilizing one or two elements as the principal components, and sometimes, minor quantities of other elements are used to enhance the properties, such as steels, NiAl intermetallics and bulk metallic glasses (BMG) [1]
The main reason is that traditional metallurgical knowledge suggests that complex phases or intermetallics will be formed in alloy systems with multiple principal components, and lead to poor mechanical properties [2]
We investigate VCrNiCoFeCu high-entropy alloy prepared by induction melting and spark plasma sintering methods

Summary

Introduction

Traditional concept of alloy systems has been based on utilizing one or two elements as the principal components, and sometimes, minor quantities of other elements are used to enhance the properties, such as steels, NiAl intermetallics and bulk metallic glasses (BMG) [1]. High entropy comes from the high number of elements in the alloy, since based on the definition as an alloy HEA system is composed of five or more kinds of principal elements in an equimolar or near equimolar ratio, with a small difference in atomic radii (

Results and discussion

Electrochemical properties and variation in the microstructure after the test

Conclusions