Phase stability of non-equiatomic CoCrFeMnNi high entropy alloys

• Published in: Acta materialia Vol. 98; pp. 288 - 296
• Main Authors: Ma, Duancheng, Yao, Mengji, Pradeep, K.G., Tasan, Cemal C., Springer, Hauke, Raabe, Dierk
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-10-2015
• Subjects: Alloy systems; Alloys; CALPHAD; Computer simulation; Entropy; High entropy alloy; Mathematical models; Phase stability; Phase transformations; Solidification; Thermodynamics; Thermodynamics; CALPHAD; Phase stability; High entropy alloy
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/j.actamat.2015.07.030

The objective of this study is to experimentally and theoretically investigate the phase stability of non-equiatomic FexMn62−xNi30Co6Cr2 based high entropy alloys, where x ranges from 22 to 42at.%. Another aim is to systematically and critically assess the predictive capability of the CALPHAD approach for such high entropy alloy systems. We find that the CALPHAD simulations provide a very consistent assessment of phase stability yielding good agreement with experimental observations. These include the equilibrium phase formation at high temperatures, the constituent phases after non-equilibrium solidification processes, unfavorable segregation profiles inherited from solidification together with the associated nucleation and growth of low temperature phases, and undesired martensitic transformation effects. Encouraged by these consistent theoretical and experimental results, we extend our simulations to other alloy systems with equiatomic compositions reported in the literature. Using these other equiatomic model systems we demonstrate how systematic CALPHAD simulations can improve and accelerate the design of multicomponent alloy systems.