Abstract
Cu-Zn-Mn-Ni-Sn high-entropy (HE) and Cu-Zn-Mn-Ni medium-entropy (ME) brasses were designed and the ingots were fabricated by conventional casting process via metallic mold casting. The ingots of the equiatomic CuZnMnNi ME brass showed dendrite structures composed of body-centered-cubic (BCC) and face-centered-cubic (FCC) phases. A single FCC phase was obtained in the ingots of non-equiatomic CuxZnMnNi (x = 2, 3, and 4) ME brasses. The addition of Sn to CuxZnMnNi (x = 1, and 2) ME brasses significantly affected the solidification microstructure and the constituent phases. The ingots of the CuZnMnNiSn0.2 HE brass showed only sharp peaks corresponding to BCC phase in XRD patterns. The Sn addition to CuxZnMnNi (x = 1, and 2) ME brasses led to superior mechanical strength in the ingots.
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