Spatial distribution of HfBi in metallurgically and electrochemically formed Bi-Hf alloy
| Autor: | Il Soon Hwang, Jaeyeong Park, Jungho Hur, Sungjune Sohn, Gwan Yoon Jeong, Seongjin Jeong |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Mechanical Engineering Diffusion Alloy Metals and Alloys Analytical chemistry Intermetallic chemistry.chemical_element 02 engineering and technology Tungsten engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences chemistry Mechanics of Materials Phase (matter) Electrode Materials Chemistry engineering Cyclic voltammetry 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 790:772-782 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.03.174 |
| Popis: | This study presents the spatial distribution of HfBi intermetallic compound in Bi-Hf alloy formed by potentiostatic electrodeposition to investigate the feasibility of density-based separation between Zr and Hf in liquid Bi phase. Prior to electrochemical alloy formation, four Bi-Hf alloys were produced metallurgically with the consideration of the Hf concentration in the alloy and the mixing effect on the liquid Bi. Then electrochemical behaviors of HfCl4 in LiCl-KCl were investigated by cyclic voltammetry (CV) using tungsten and Bi coated electrode at 500 °C. The apparent reduction potential and diffusion coefficient were calculated by determination of reversibility for single redox reaction of Hf4+/Hf. Two Bi-Hf alloys were produced by potentiostatic electrodeposition in LiCl-KCl-HfCl4/Bi system at 500 °C. Applied cathodic potential of −1.1 V vs. Ag/AgCl 1 wt % was determined from the CV results. The spatial distribution of intermetallic compound was obtained on the vertical cross section of Bi-Hf alloys. HfBi phase was characterized by SEM-EDS and XRD analysis. It is identified that HfBi was clearly formed and precipitated in the bottom of the Bi-Hf alloy during the electrodeposition, supporting the possibility of the separation of Hf from Zr by their density differences. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect