Liquid-phase separation of immiscible CrCuxFeMoyNi high-entropy alloys. Issue 11 (24th July 2017)

• Record Type: Journal Article
• Authors: Peng, Z.; Liu, N.; Zhang, S. Y.; Wu, P. H.; Wang, X. J.
• Is Part Of: Materials science and technology. Volume 33:Issue 11(2017)
• Page Start: 1352
• Page End: 1359
• Publication Date: 2017-07-24
• Subjects: High-entropy alloys -- liquid-phase separation -- mixing enthalpy -- microstructures; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2017.1290736
• Languages: English
• ISSNs: 0267-0836

Abstract

ABSTRACT: Taking into consideration the large positive mixing enthalpy of Cu–Mo, in this work, the relative content of Cu and Mo elements was adjusted to investigate the solidification process and microstructure formation of CrCu x FeMo y Ni high-entropy alloys. For CrCu0.5 FeMoy Ni ( y = 0.5, 1) high-entropy alloys, many Cu-rich spheres were observed in the as-solidified microstructures, while macroscopic phase separation structures were obtained in CrCuFeMo y Ni ( y = 0.5, 1) alloys. Liquid-phase separation occurred in high-entropy alloys when the enthalpy of mixing (Δ H mix ）was positive, the valence electron concentration (VEC) was in a range of 8.09–8.44 and the difference in atomic radii ( δ ) was between 3.39 and 4.25. For lower positive Δ H mix, Cu-rich spheres were observed, while for higher positive Δ H mix, macroscopic phase-separated structures were obtained.