J. Mater. Sci. Technol. ›› 2020, Vol. 43: 40-43.DOI: 10.1016/j.jmst.2020.01.002

Special Issue: High Entropy Alloys 2018-2020

• Research Article • Previous Articles     Next Articles

Fabricating CoCrFeMnNi high entropy alloy via selective laser melting in-situ alloying

Peng Chenab, Sheng Lia, Yinghao Zhoub, Ming Yanb*(), Moataz M. Attallaha*()   

  1. a Advanced Materials Processing Laboratory, University of Birmingham, Birmingham B15 2TT, UK
    b Department of Materials Science and Engineering, and Shenzhen Key Laboratory for Additive Manufacturing of High Performance Materials, Southern University of Science and Technology, Shenzhen 518055, China
  • Received:2019-05-31 Accepted:2019-09-05 Published:2020-04-15 Online:2020-04-26
  • Contact: Yan Ming,Attallah Moataz M.

Abstract:

Quasi-equiatomic CoCrFeMnNi high entropy alloy (HEA) has been in-situ alloyed by selective laser melting (SLM) from a blend of CoCrFeNi pre-alloyed powder and Mn elemental powder. The blended powder shows good printability with various SLM parameters and the as-built HEA samples achieve a reliable forming quality. Despite the slight evaporation of Mn, energy dispersive spectrometer mapping and X-ray diffraction results show that the as-built HEA has a homogeneous chemical distribution and presents a single face-centred-cubic (fcc) phase, indicating successful in-situ alloying. The study has verified the feasibility of using blended powder to prepare high-quality HEA by SLM.

Key words: High entropy alloys, Laser processing, Selective laser melting, In-situ alloying, CoCrFeMnNi, Crystal structure