Accessible Unlicensed Requires Authentication Published by De Gruyter August 30, 2018

Microstructural evolution, phase selection and properties of CoCrCuFeMnxNi high-entropy alloys

Wendong Du, Ning Liu, Pengjie Zhou, Xiaojing Wang, Bin Wang and Zhen Peng

Abstract

Manganese was added to face-centered-cubic (fcc) high-entropy CoCrCuFeNi alloy to investigate the effects of Mn content on the microstructures, phase selection, and properties of CoCrCuFeMnxNi. CoCrCuFeMnxNi showed typical dendrite and interdendritic structures, and nanoprecipitates including Cu-rich cubic and Cr-rich acicular ones, were obtained in the interdendritic region. Calculated phase-selection-related parameters indicated that the formation of fcc phase was favored. Although two fcc structures were detected by X-ray diffraction, the interdendritic region showed body-centered-cubic, Cr-rich nanoprecipitates when x < 0.5. It is worth noting that the CoCrCuFeMn2.0Ni interdendrites showed an amorphous phase. CoCrCuFeMnxNi showed considerable ductility and increasing compressive strengths with increasing Mn content.


*Correspondence address, Dr. Ning Liu, School of Materials Science and Engineering, Jiangsu University of Science and Technology, No. 2 Mengxi Road, Zhenjiang, Jiangsu, 212003, P. R. China, Tel.: +86-511-84407569, Fax: +86-511-84407381, E-mail:

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Received: 2017-12-25
Accepted: 2018-05-17
Published Online: 2018-08-30
Published in Print: 2018-09-14

© 2018, Carl Hanser Verlag, München