High-Entropy Alloys by unknow

Author:unknow
Language: eng
Format: epub
ISBN: 9780128005262
Publisher: Elsevier Science
Published: 2014-03-15T00:00:00+00:00

Obviously, nonequiatomic HEAs might also have two or more phases. AlCoCuxNiZnTi exhibits a simple solid solution structure (FCC+BCC) for different copper contents (Varalakshmi et al., 2010b). In all these cases, the phases observed are similar to those observed for corresponding equiatomic HEAs. Ren et al. (2012) studied a series of nonequiatomic HEAs containing Cr, Cu, Fe, Mn, and Ni by varying two elements at a time. In all the alloys, they observed either FCC or FCC+BCC structures without the formation of any complex phases or compounds.

The influence of processing routes on nonequiatomic HEAs is similar to that of equiatomic HEAs. Nonequilibrium processing routes like MA and rapid solidification techniques are more likely to give raise to single-phase structures whereas equilibrium synthesis techniques like casting, in some cases, can lead to the formation of intermetallic phases. Al0.5CoCrCuFeNi exhibits a single-phase FCC structure when prepared by magnetron sputtering (Chen et al., 2005a) whereas the formation of ordered L12 phase is observed when the same alloy is processed through arc melting route (Hemphill et al., 2012). Huang et al. (2004) showed that AlCrFeMo0.5NiSiTi exhibits a mixed-phase structure containing one B2 phase and two FCC phases when processed through arc melting and casting, while it shows almost a single-phase BCC structure when prepared by plasma spraying.

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