https://scholars.lib.ntu.edu.tw/handle/123456789/625156
標題: | High temperature electrical properties and oxidation resistance of V-Nb-Mo-Ta-W high entropy alloy thin films | 作者: | Chen Y.-Y Hung S.-B Wang C.-J WEN-CHENG J. WEI Lee J.-W. |
關鍵字: | Electrical resistivity; High entropy alloy thin film; Oxidation; V-Nb-Mo-Ta-W | 公開日期: | 2019 | 卷: | 375 | 起(迄)頁: | 854-863 | 來源出版物: | Surface and Coatings Technology | 摘要: | High entropy alloys (HEA) show outstanding thermodynamic, mechanical or thermal properties as compared with pure metals or binary alloys. Among several kinds of HEAs, the refractory element containing HEAs exhibit relatively high thermal stability and better mechanical properties at elevated temperature. In this study, the V19.2Nb19.4Mo20.3Ta19.5W21.6 high entropy alloy thin films were deposited on the AISI 304 stainless steel substrates by a magnetron sputtering process. The oxidation behavior and electrical conductivities of HEA thin films at different temperatures were evaluated. The body-centered cubic (BCC) structure of HEA thin film can be kept up to 500 °C oxidation, and it transferred to V-Nb-Mo-Ta-W based oxides and then turned to iron contained oxide phases when the oxidation temperature increased to 700 °C. The electrical resistivity of thin film increased with oxidation temperature. The electrochemical impedance spectroscope (EIS) analysis showed that the total apparent resistivity values of 304SS substrate coated with V19.2Nb19.4Mo20.3Ta19.5W21.6 high entropy alloy thin film at 600, 700 and 800 °C were 5.80, 6.91, and 7.71 Ω·cm, respectively. The electrical resistance of the HEA coated sample was contributed by the oxide resistance and interface polarization. Through the electrical property analysis at high temperatures, the HEA thin film can provide a protection layer to the 304SS substrate and kept the sample's high temperature apparent resistivity to a relatively lower value. © 2019 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85070525612&doi=10.1016%2fj.surfcoat.2019.07.080&partnerID=40&md5=ff587130414134d199bc0d7a7b137de8 https://scholars.lib.ntu.edu.tw/handle/123456789/625156 |
ISSN: | 02578972 | DOI: | 10.1016/j.surfcoat.2019.07.080 | SDG/關鍵字: | Binary alloys; Crystal structure; Electric conductivity; Entropy; High-entropy alloys; Iron oxides; Molybdenum alloys; Niobium alloys; Oxidation; Oxidation resistance; Substrates; Tantalum alloys; Tantalum compounds; Temperature; Tungsten alloys; Vanadium alloys; AISI-304 stainless steel; Body-centered cubic (bcc) structure; Electrical conductivity; Electrical resistances; Electrical resistivity of thin films; Electrochemical impedance; High thermal stability; Magnetron sputtering process; Thin films |
顯示於: | 材料科學與工程學系 |
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