Effect of Annealing Heat Treatment on the Microstructure and Electrochemical Properties of FeCoNiCrMn High-Entropy Alloy
Subject Areas : Research On Surface Engineering and Nanomaterials Science
erfan bigdeloyevatan
1
,
mehdi salimi
2
*
1 - Department of Materials Science and Engineering, Faculty of Engineering, University of Zanjan, Zanjan, Iran
2 - Department of Materials Science and Engineering, Islamic Azad university of Zanjan, Zanjan, Iran
Keywords: High entropy alloy, Spark plasma sintering, FCC solid solution, Mechanical alloying,
Abstract :
In this study, a Fe-Co-Ni-Cr-Mn powder mixture with equiatomic composition was subjected to mechanical milling for 20 hours. The milled powder was then consolidated using Spark Plasma Sintering (SPS) at 1100 °C, followed by annealing at 900 °C to achieve microstructural homogenization. Microstructural analysis of the milled powder indicated that increasing the milling time from 5 to 20 hours led to a reduction in particle size and the formation of a nearly uniform morphology. After 20 hours of mechanical alloying, a single-phase solid solution with FCC structure was obtained. Phase characterization of the SPS and annealed samples revealed that the SPS sample exhibited a dual-phase structure of FCC and BCC, while the annealing treatment transformed this dual-phase structure into a single-phase FCC. Electrochemical tests demonstrated that the corrosion resistance of the annealed sample was superior to that of the SPS sample. This improvement is attributed to the dual-phase structure in the SPS sample, which creates galvanic cells between the FCC and BCC phases, leading to increased release of metallic ions. In contrast, the single-phase structure of the annealed sample does not exhibit this corrosion mechanism. Additionally, the charge transfer resistance of the annealed sample increased by ...% compared to the SPS sample.
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