TY - JOUR
T1 - Mechanical Synthesis and Hydrogen Storage Characterization of MgVCr and MgVTiCrFe High-Entropy Alloy
AU - de Marco, Marcelo Orpinelli
AU - Li, Yongtao
AU - Li, Hai Wen
AU - Edalati, Kaveh
AU - Floriano, Ricardo
N1 - Funding Information:
R.F. thanks the Brazilian research funding agencies FAPESP (regular project no. 2018/15968‐4) and CNPq (no. 401429/2016‐4) for financial support. M.O. de M. thanks FAEPEX/UNICAMP and CAPES for financial support. K.E. thanks the MEXT, Japan, for Grants‐in‐Aid for Scientific Research B (no. 16H04539) and Grant‐in‐Aid for Scientific Research on Innovative Area (19H05176). The authors also thank the Laboratory of Hydrogen in Metals (LHM) at the Federal University of São Carlos (UFSCar) for characterization facilities.
Funding Information:
R.F. thanks the Brazilian research funding agencies FAPESP (regular project no. 2018/15968-4) and CNPq (no. 401429/2016-4) for financial support. M.O. de M. thanks FAEPEX/UNICAMP and CAPES for financial support. K.E. thanks the MEXT, Japan, for Grants-in-Aid for Scientific Research B (no. 16H04539) and Grant-in-Aid for Scientific Research on Innovative Area (19H05176). The authors also thank the Laboratory of Hydrogen in Metals (LHM) at the Federal University of S?o Carlos (UFSCar) for characterization facilities.
Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Body-centered cubic (BCC) and high-entropy alloys are being investigated as potential hydrogen storage materials due to their ability to absorb high amounts of hydrogen at moderate temperatures. Herein, the synthesis and hydrogen storage behavior of new MgVCr BCC and MgTiVCrFe high-entropy alloys are studied. The alloys are initially synthesized by mechanical alloying via high-energy ball milling (HEBM) under hydrogen atmosphere followed by high-pressure torsion (HPT) processing to improve activation. X-ray diffraction (XRD) in combination with transmission electron microscopy (TEM) shows a very refined nanostructure in both samples with the presence of a BCC solid solution phase for MgVCr, whereas the crystalline and amorphous phases coexist in MgTiVCrFe. The MgVCr alloy exhibits fast kinetics but with a low reversible hydrogen storage capacity (up to 0.9 wt%), whereas MgTiVCrFe shows low affinity to absorb hydrogen. Moreover, MgTiVCrFe demonstrates a partial decomposition from the initial structure by hydrogen storage cycling, whereas MgVcr exhibits reasonable stability.
AB - Body-centered cubic (BCC) and high-entropy alloys are being investigated as potential hydrogen storage materials due to their ability to absorb high amounts of hydrogen at moderate temperatures. Herein, the synthesis and hydrogen storage behavior of new MgVCr BCC and MgTiVCrFe high-entropy alloys are studied. The alloys are initially synthesized by mechanical alloying via high-energy ball milling (HEBM) under hydrogen atmosphere followed by high-pressure torsion (HPT) processing to improve activation. X-ray diffraction (XRD) in combination with transmission electron microscopy (TEM) shows a very refined nanostructure in both samples with the presence of a BCC solid solution phase for MgVCr, whereas the crystalline and amorphous phases coexist in MgTiVCrFe. The MgVCr alloy exhibits fast kinetics but with a low reversible hydrogen storage capacity (up to 0.9 wt%), whereas MgTiVCrFe shows low affinity to absorb hydrogen. Moreover, MgTiVCrFe demonstrates a partial decomposition from the initial structure by hydrogen storage cycling, whereas MgVcr exhibits reasonable stability.
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U2 - 10.1002/adem.201901079
DO - 10.1002/adem.201901079
M3 - Article
AN - SCOPUS:85075747744
SN - 1438-1656
VL - 22
JO - Advanced Engineering Materials
JF - Advanced Engineering Materials
IS - 2
M1 - 1901079
ER -