A dual-phase Fe-Co-Ni-Cr-Mn high entropy alloy thin film with superior strength and corrosion-resistance

Improving the mechanical properties of high-entropy alloys (HEAs) with a face-centered cubic (fcc) structure is critical for their potential applications. In this work, a Fe-Co-Ni-Cr-Mn thin film was prepared and deposited with a power of 360 W. This alloy thin film exhibits a dual-phase microstruct...

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Published inJournal of alloys and compounds Vol. 1003; p. 175551
Main Authors Cao, Qingping, Wang, Nan, Kim, Jae-Moo, Caron, Arnaud, Zhang, Zhipeng, Zhou, Haofei, Wang, Xiaodong, Ding, Shaoqing, Zhang, Dongxian, Jiang, Jian-Zhong
Format Journal Article
LanguageEnglish
Published Elsevier B.V 25.10.2024
Subjects
Corrosion resistance
High-entropy alloy
Mechanical properties
Thin films
Thin films
Corrosion resistance
Mechanical properties
High-entropy alloy
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Summary:Improving the mechanical properties of high-entropy alloys (HEAs) with a face-centered cubic (fcc) structure is critical for their potential applications. In this work, a Fe-Co-Ni-Cr-Mn thin film was prepared and deposited with a power of 360 W. This alloy thin film exhibits a dual-phase microstructure consisting of a fcc matrix and sigma phase (σ phase) precipitates. The 360 W-film shows ultra-high strength-ductility synergy, with a hardness of 10.4 GPa, yield strength of 6.2 GPa, and a fracture strain of ∼25 % (micro-pillar compression tests). The excellent mechanical properties can be mainly attributed to the grain size effect, the hardening effect of the σ precipitates, and deformation twinning. Moreover, this alloy thin film exhibits excellent tribological performances and corrosion resistance. Our results demonstrate high potential of the dual-phase HEA thin film for industrial applications as high-performance protective coating materials. •Fe-Co-Ni-Cr-Mn thin film exhibited a dual phase microstructure consisting of a fcc matrix and σ phase precipitates.•Ultra-high strength-ductility synergy with hardness of 10.4 GPa, yield strength of 6.2 GPa, and fracture strain of ~25 %.•Mechanical properties are attributed to grain size effect, σ precipitate hardening effect, and deformation twinning.•This alloy thin-film exhibits excellent tribological performances and corrosion resistance.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2024.175551