Abstract
The effects of Ti and Si addition on the phase equilibrium and mechanical properties of the equiatomic CoCrFeMnNi high entropy alloy (Cantor alloy) were investigated. The phase equilibrium at 1000 °C was determined from the result of X-ray diffraction and electron probe micro-analysis. Ti addition stabilizes the sigma phase, A12 phase and C14-Laves phase, while Si addition stabilizes the A13 phase. The phase relationships were represented by projection onto (Co, Fe, Mn, Ni)–Cr–X(Ti or Si) isothermal ternary cross-section at 1000 °C in Co–Cr–Fe–Mn–Ni–X senary system. Tensile tests were conducted on Cantor-based fcc single solid solution alloys with Ti or Si dissolution at room temperature. The 0.2% yield strength and ultimate tensile strength increased with either element addition. The Ti-added alloy showed higher strength than the Si-added alloy. The difference in ductility in the alloys is related to their strain hardening behavior in the higher strain range.Graphic abstract
Highlights
High entropy alloys, which are composed of multiple principal elements, have been attracting attention as structural materials
Various researchers reported that the addition of an extra element introduces second phases into Cantor alloy, few studies have focused on the phase equilibrium in well-homogenized alloys [13,14,15,16,17,18,19]
Cantor alloy is taken as an equiatomic fcc single solid solution alloy, several studies reported the existence of some second phases other than σ phase as discussed in the previous section
Summary
High entropy alloys, which are composed of multiple principal elements, have been attracting attention as structural materials. The concept of a high entropy alloy was first proposed by Yeh et al.[1], and Cantor et al reported a face-centered cubic (fcc) single solid solution alloy composed of equiatomic Co, Cr, Fe, Mn and Ni (well-known as Cantor alloy) [2]. These multicomponent alloys with near equiatomic composition show excellent properties such as high strength and high ductility [3,4,5,6,7]. This would be the basis for the development of a CALPHAD-type database for phase diagram calculations
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
