Microstructure and Electrochemical Behaviors of Equiatomic TiMoVCrZr and Ti-rich TiMoVCrZr High-Entropy Alloys for Metallic Biomaterials

• Autorzy: Song Hocheol , Lee Seongi , Lee Kwangmin

Identyfikatory

DOI

10.24425/amm.2020.133692

• Języki publikacji: EN

Abstrakty

EN

The present study investigated various thermodynamic parameters, microstructures and electrochemical behaviors of TiMoVCrZr and Ti-rich TiMoVCrZr high-entropy alloys (HEAs) prepared by vacuum arc remelting. The microstructures of the alloys were analyzed using X-ray diffraction (XRD) analysis, field emission scanning electron microscopy (FE-SEM), and potentiodynamic polarization tests. The determined thermodynamic values of the Ω-parameter and the atomic size difference (δ) for the HEAs were determined to be in the range of Ω ≥ 1.1, and δ ≤ 6.6% with valance electron configuration (VEC) ≤ 5.0, suggesting the HEAs were effective at forming solid solutions. XRD patterns of the equiatomic Ti₂₀ Mo₂₀ V₂₀ Cr₂₀ Zr₂₀ HEA revealed four phases consisting of the body centered cubic₁ (BCC₁ ), BCC₂ , hexagonal close-packed (HCP), and intermetallic compound Cr₂ Zr phases. Three phases were observed in the XRD patterns of Ti-rich Ti₄₀ Mo₁₅ V₁₅ Cr₁₅ Zr₁₅ (BCC, HCP, and Cr₂ Zr) and a single BCC phase was observed in Ti-rich Ti₆₀ Mo₁₀ V₁₀ Cr₁₀ Zr₁₀ HEAs. The backscattered-electron (BSE) images on the equiatomic Ti₂₀ Mo₂₀ V₂₀ Cr₂₀ Zr₂₀ HEA revealed BCC and HCP phases with Cr₂ Zr precipitates, suggesting precipitation from the HCP solid solution during the cooling. The micro-segregation of Ti-rich Ti₆₀ Mo₁₀ V₁₀ Cr₁₀ Zr₁₀ HEAs appeared to decrease remarkably. The alloying elements in the HEAs were locally present and no phase changes occurred even after additional HIP treatment. The lowest current density obtained in the polarization potential test of Ti-rich Ti₄₀ Mo₁₅ V₁₅ Cr₁₅ Zr₁₅ HEA was 7.12×10^-4 mA/cm² was obtained. The studied TiMoVCrZr HEAs showed improved corrosion characteristics as compared to currently available joint replacement material such as ASTM F75 alloy.

Słowa kluczowe

EN

high entropy alloy; TiMoVCrZr; hot isostatic pressing; potentiodynamic polarization

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2020
• Tom: Vol. 65, iss. 4
• Strony: 1317--1322
• Opis fizyczny: Bibliogr. 11 poz., fot., rys., tab., wzory

Twórcy

autor

Song Hocheol

• Chonnam National University, School of Materials Science & Engineering, Gwangju 61186, Republic of Korea

autor

Lee Seongi

• Chonnam National University, School of Materials Science & Engineering, Gwangju 61186, Republic of Korea

autor

Lee Kwangmin

• Chonnam National University, School of Materials Science & Engineering, Gwangju 61186, Republic of Korea

Bibliografia

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Uwagi

EN

1. This research was supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2018R1D1A1B07041526).

PL

2. Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).