4.7 Article

Effect of Nb addition on the microstructure and properties of AlCoCrFeNi high-entropy alloy

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.10.110

Keywords

High entropy alloy; Eutectic; Laves phase; Solid solution

Funding

  1. National Natural Science Foundation of China (NNSFC) [50971019]

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The microstructures and properties of the AlCoCrFeNbxNi high-entropy alloys (HEAs) were investigated. Two phases were found in the prepared AlCoCrFeNbxNi HEAs: one is body-centered-cubic (BCC) solid solution phase; the other is the Laves phase of (CoCr)Nb type. The microstructures of the alloy series vary from hypoeutectic to hypereutectic, and the compressive yield strength and Vickers hardness have an approximately linear increase with increasing Nb content. The residual magnetization (Mr) reaches a maximum for AlCoCrFeNb0.1Ni alloy, which is 6.106 emu/g. The factor of Omega, which is defined as entropy of mixing times 1000 over enthalpy of mixing, well predicts the phase formation for the multicomponents alloys. (C) 2011 Elsevier B.V. All rights reserved.

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