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Hydrogen-induced phase transition of MgZrTiFe0.5Co0.5Ni0.5 high entropy alloy |
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| Authors: | G Zepon DR Leiva RB Strozi A Bedoch SJA Figueroa TT Ishikawa WJ Botta |
| Affiliation: | 1. Department of Materials Engineering, Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil;2. Graduate Program of Materials Science and Engineering, Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil;3. Brazilian Synchrotron Light Laboratory (LNLS), Center for Research in Energy and Materials (CNPEM), Campinas, SP, Brazil |
| Abstract: | In this study, the MgZrTiFe0.5Co0.5Ni0.5 high entropy alloy was processed by high-energy ball milling under both argon and hydrogen atmospheres. The hydrogen storage behavior of the samples was evaluated by combination of thermal analyses and in-situ synchrotron powder X-ray diffraction. It is shown that this alloy forms a body-centered cubic (BCC) structure when milled under argon pressure. The BCC phase is capable to absorb up to 1.2%wt. of hydrogen and during absorption it undergoes a phase transition forming a face-centered cubic (FCC) high entropy hydride. This FCC hydride can be directly synthesized by high-energy ball milling under hydrogen pressure. |
| Keywords: | High entropy alloy High-energy ball milling Hydrogen storage |
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