Study of the Microstructure of High-Entropy Alloys AlFeCuCoNiCrTiX (x=0, 05, 1.0)
The microstructure of high-entropy Alloys AlFeCuCoNiCrTix (x=0, 05, 1.0) with different titanium contents had been studied. The results showed that: (1) The microstructure of AlFeCuCoNiCrTix exhibited the trend from dendritic structure to eutectic-cell structure as the titanium contents increasing and spinodal decomposition, nanoprecipitation and amorphous phase can be also observed; (2) Composition segregation appeared (especially Cu) and Ti promoted the segregation of Cu; (3) Alloys was consisted of FCC and BCC, and phases gradually converted from FCC+BCC1 to FCC+BCC1+BCC2 with addition of titanium and BCC2 became the leading phase; (4) Both ordering and spinodal decomposition coincided due to the difference of atomic size and high entropy effect.
H. F. Sun et al., "Study of the Microstructure of High-Entropy Alloys AlFeCuCoNiCrTiX (x=0, 05, 1.0)", Applied Mechanics and Materials, Vols. 66-68, pp. 894-900, 2011