Phases, microstructures and properties of multi-component FeCoNi-based alloys

ABSTRACT

Disordered and ordered solid solution phases are identified in FeCoNi-based multi-component alloys. An ultimate strength of 2380 MPa was achieved in the dual face-centered cubic + body-centered cubic structural (FeCoNi)₆₀Al₁₅Cr₂₅ alloy, accompanied by a fracture strain of 38% and a hardness of 376.3 HV. After holding at 900°C for 100 h, oxidation resistance of the alloys follows by an increasing rank of (FeCoNi)₈₅Al₁₅ < (FeCoNi)₇₅Cr₂₅ < (FeCoNi)₆₀Al₁₅Cr₂₅. Moreover, the oxidation kinetic curves of the alloys follow a power-law dependence. (FeCoNi)₆₀Al₁₅Cr₂₅ alloy shows a good trade-off of mechanical properties and an excellent oxidation resistance at evaluated temperature, and can be a potential candidate for high temperature materials.

KEYWORDS:

• High-entropy alloys
• microstructure
• property
• oxidation resistance
• oxidation kinetics

Disclosure statement

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

ORCID

Ning Liu http://orcid.org/0000-0003-2020-9226

Additional information

Funding

The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (51201072) and Jiangsu Natural Science Foundation (BK20161270). Wen Ding is grateful to the financial support of Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX19-1674). The authors are grateful to the financial support of the Priority Academic Program Development of Jiangsu Higher Education Institutions.