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<p>Biomaterial high-entropy alloys (Bio-HEAs) are attractive in terms of materials design, fabrication, and properties. Generally, Bio-HEAs are prepared primarily using vacuum arc melting, by which the ingots are remelted multiple times. However, the number of remelting cycles is mostly not explicitly determined. This work aims to reveal the effect of remelting cycles during the preparation of a CoCrMoMnTi Bio-HEA on its microstructure, hardness, and corrosion behavior. Equiatomic CoCrMoMnTi (CCM-MnTi) ingots were prepared by vacuum arc melting on a water-cooled copper mold in an argon atmosphere. The ingots button underwent 4, 8, and 12 flippings during remelting. Scanning electron microscope and x-ray diffractometer examined the&#xa0;shape, size and distribution of&#xa0;microstructure and phase. Potentiodynamic polarization combined with electron impedance spectroscopy (EIS) and Mott–Schottky analyses was applied to characterize the corrosion behavior in Hanks’ solution. The remelting process induced Mn loss and Ti and Cr segregation in the CCM-MnTi alloys, despite the composition fulfilling the HEA criteria. The intermetallic phases were fragmented and dispersed after repeated remelting processes. The as-cast state exhibited the BCC and HCP Laves phases. Potentiodynamic polarization, EIS, and Mott–Schottky analyses confirmed that Mn loss accompanied by Cr and Ti segregation was found to accelerate the CCM-MnTi degradation in Hanks’ solution. The CCM-MnTi Bio-HEA ingot remelted for 4 cycles exhibited the lowest corrosion rate of 0.00487 mmpy, which is lower than that of the commercial Co-Cr-Mo implant material. The post-corrosion analysis affirmed the electrochemical characteristics of the alloys; a narrow-deep with an irregular shape morphology was observed on the surface of RM#8, in which the highest corrosion rate was exhibited.</p>

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Effect of Remelting Cycle on Microstructure and Corrosion Behavior of an Equiatomic CoCrMoMnTi Bio-High-Entropy Alloy

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Fendy Rokhmanto,
  • Aprilia Erryani,
  • Yudi Nugraha Thaha,
  • Ika Kartika,
  • Albertus Deny Heri Setyawan,
  • Ahmad Zakiyuddin,
  • Sri Harjanto

摘要

Biomaterial high-entropy alloys (Bio-HEAs) are attractive in terms of materials design, fabrication, and properties. Generally, Bio-HEAs are prepared primarily using vacuum arc melting, by which the ingots are remelted multiple times. However, the number of remelting cycles is mostly not explicitly determined. This work aims to reveal the effect of remelting cycles during the preparation of a CoCrMoMnTi Bio-HEA on its microstructure, hardness, and corrosion behavior. Equiatomic CoCrMoMnTi (CCM-MnTi) ingots were prepared by vacuum arc melting on a water-cooled copper mold in an argon atmosphere. The ingots button underwent 4, 8, and 12 flippings during remelting. Scanning electron microscope and x-ray diffractometer examined the shape, size and distribution of microstructure and phase. Potentiodynamic polarization combined with electron impedance spectroscopy (EIS) and Mott–Schottky analyses was applied to characterize the corrosion behavior in Hanks’ solution. The remelting process induced Mn loss and Ti and Cr segregation in the CCM-MnTi alloys, despite the composition fulfilling the HEA criteria. The intermetallic phases were fragmented and dispersed after repeated remelting processes. The as-cast state exhibited the BCC and HCP Laves phases. Potentiodynamic polarization, EIS, and Mott–Schottky analyses confirmed that Mn loss accompanied by Cr and Ti segregation was found to accelerate the CCM-MnTi degradation in Hanks’ solution. The CCM-MnTi Bio-HEA ingot remelted for 4 cycles exhibited the lowest corrosion rate of 0.00487 mmpy, which is lower than that of the commercial Co-Cr-Mo implant material. The post-corrosion analysis affirmed the electrochemical characteristics of the alloys; a narrow-deep with an irregular shape morphology was observed on the surface of RM#8, in which the highest corrosion rate was exhibited.