Materials Transactions Online

Materials Transactions, Vol.59 No.05 (2018) pp.741-746
© 2018 The Japan Institute of Metals and Materials

New Mg-V-Cr BCC Alloys Synthesized by High-Pressure Torsion and Ball Milling

Keisuke Fujiwara1, Ryoko Uehiro1, Kaveh Edalati1, 2, Hai-Wen Li2, 3, 4, Ricardo Floriano5, Etsuo Akiba2, 3 and Zenji Horita1, 2

1Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka, Japan
2WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka, Japan
3International Research Center for Hydrogen Energy, Kyushu University, Fukuoka, Japan
4Kyushu University Platform of Inter/Transdisciplinary Energy Research, Fukuoka, Japan
5Faculdade de CiĂȘncias Aplicadas, Universidade Estadual de Campinas (FCA-UNICAMP), Rua Pedro Zaccaria, 1300, CEP 13484-350, Limeira -SP, Brazil

Mg-V-Cr alloys can be considered as alternatives to the Ti-V-Cr BCC (body-centered cubic) alloys for hydrogen storage at room temperature, but their synthesis has not been successful so far because Mg is immiscible in V and Cr. In this study, the first Mg-V-Cr BCC alloys were synthesized from elemental powders by severe plastic deformation via the high-pressure torsion (HPT) method as well as by high-energy ball milling. Structural homogeneity, thermal stability and hydrogen storage at room temperature were dependent on the composition and the best performances were achieved for the MgVCr composition with the maximum configurational entropy.


(Received 2018/01/09; Accepted 2018/02/27; Published 2018/04/25)

Keywords: metal hydrides, hydrogen storage, mechanical alloying, severe plastic deformation (SPD), magnesium-vanadium-chromium alloys

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