A series of equiatomic and non-equiatomic Fex(NiCrCo)100−x (at.-%, x = 25, 45, 55, 65, 75 and 85) multicomponent alloys were prepared and studied. With the increase in x, the phase structure of the alloys evolves from a single FCC phase (x = 25, 45 and 55), to a mixture of FCC and BCC phases (x = 55) and finally to a single BCC phase (x = 65 and 75). As a result, the BCC-structured alloys have much higher strength and hardness than the FCC-structured alloys. The existing VEC criteria are unable to predict the FCC-BCC phase transition in these alloys.
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