期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 36, 期 -, 页码 128-133出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2019.05.066
关键词
Nanoporous metals; Fe-Pt-B alloy; Dealloying; L1(0)-FePt; Magnetic property
资金
- National Natural Science Foundation of China [51571047, 51171034]
- Fundamental Research Funds for the Central Universities [DUT17ZD212]
- Global Institute for Materials Research Tohoku Program, Japan
A nanoporous FePt alloy has been fabricated by dealloying a melt-spun Fe60Pt20B20 alloy composed of nanoscale amorphous and face-centered-cubic FePt (fcc-FePt) phases in H2SO4 aqueous solution. The nanoporous alloy consists of single fcc-FePt phase with an Fe/Pt atomic ratio of about 55.3/44.7, and possesses a uniform interpenetrating ligament-channel structure with average ligament and pore sizes of 27 nm and 12 nm, respectively. The nanoporous fcc-FePt alloy shows soft magnetic characteristics with a saturation magnetization of 37.9 emu/g and better electrocatalytic activity for methanol oxidation than commercial Pt/C in acidic environment. The phase transformation from disordered fcc-FePt into ordered face-centered-tetragonal FePt (L1(0)-FePt) in the nanoporous alloy has been realized after annealing at 823-943 K for 600 s. The volume fraction of the L1(0)-FePt phase in the alloy increases with the rise of annealing temperature, which results in the enhancements of coercivity and saturation magnetization from 0.14 kOe and 38.5 emu/g to 8.42 kOe and 51.4 emu/g, respectively. The ligament size of the samples is increased after annealing. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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