Microstructure and properties change in Al_5+xCr₁₂Fe₃₅Mn_28-xNi₂₀ high entropy alloys

Abstract

In the present study, a non-equiatomic AlCrFeMnNi high-entropy alloy (HEA) bearing cost-effective elements has been developed to enhance the strength by increasing the Al content. The HEAs were prepared by employing the arc melting technique. The microstructure of cast HEAs was studied by electron microprobe analysis (EPMA), electron backscattering diffraction (EBSD), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The mechanical properties were evaluated at room temperature. The results show that the latter duplex structure exhibited significantly higher compressive strength, 2.5 GPa at 50% strain. The measured ductility under the tensile stress of the duplex structure was considerably low. This is attributed to the various stress states in compression and tension, the phase structures, and the induced deformation mechanism in the studied HEAs.

KEYWORDS:

• High-entropy alloys (HEAs)
• strengthening
• twining-induced plasticity (TWIP)
• elemental segregation
• mechanical properties

Acknowledgements

The authors would like to thank the Japan International Cooperation Agency for offering the facility and tools needed to conduct this work.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Correction Statement

This article has been corrected with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

This work was supported by Egyptian Ministry of Higher Education (MOHE); the Egypt-Japan University of Science and Technology (E-JUST) as well as Institute for Materials Research, Tohoku University (Proposal No. 18GK0012).