TY - JOUR
T1 - FCC phase formation in immiscible Mg-Hf (magnesium-hafnium) system by high-pressure torsion
AU - Gómez, Edgar Ignacio López
AU - Edalati, Kaveh
AU - Coimbrão, Diego Davi
AU - Antiqueira, Flávio José
AU - Zepon, Guilherme
AU - Cubero-Sesin, Jorge M.
AU - Botta, Walter José
N1 - Funding Information:
One of the authors (E.I.L.G.) acknowledges the funding and scholarship from the Doctorate in Engineering Program and the Graduate Directorate of ITCR, Costa Rica. This work was supported in part by the Light Metals Educational Foundation of Japan, in part by grants-in-aid for scientific research from the MEXT, Japan (Grant Nos. 16H04539 and 19H05176), in part by the Brazilian agencies FAPESP (Grant No. 2019-09816-0), CNPq, and CAPES, and in part by the ITCR, Costa Rica (Grant No. VIE-CF1490018). The authors thank the Laboratory of Structural Characterization (LCE/DEMa/UFSCar), Brazil, for electron microscopy.
Publisher Copyright:
© 2020 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
PY - 2020/5/1
Y1 - 2020/5/1
N2 - Magnesium and hafnium, two hydride-forming and biocompatible metals with hexagonal close-packed crystal structures, are thermodynamically immiscible even in the liquid form. In this study, these two elements were mechanically mixed by high-pressure torsion straining, and a new FCC (face-centered cubic) phase was formed although these two elements do not form the FCC phase even under high pressure or at high temperature. Microstructural examination by scanning-transmission electron microscopy combined with an ASTAR automatic crystal orientation and phase mapping technique confirmed that the FCC phase was stabilized mainly in the Hf-rich nanograins with localized supersaturation. Attempts to control the phase transformations under a hydrogen atmosphere to produce ternary magnesium-hafnium hydrides for hydrogen storage applications were unsuccessful; however, the material exhibited enhanced hardness to an acceptable level for some biomedical applications.
AB - Magnesium and hafnium, two hydride-forming and biocompatible metals with hexagonal close-packed crystal structures, are thermodynamically immiscible even in the liquid form. In this study, these two elements were mechanically mixed by high-pressure torsion straining, and a new FCC (face-centered cubic) phase was formed although these two elements do not form the FCC phase even under high pressure or at high temperature. Microstructural examination by scanning-transmission electron microscopy combined with an ASTAR automatic crystal orientation and phase mapping technique confirmed that the FCC phase was stabilized mainly in the Hf-rich nanograins with localized supersaturation. Attempts to control the phase transformations under a hydrogen atmosphere to produce ternary magnesium-hafnium hydrides for hydrogen storage applications were unsuccessful; however, the material exhibited enhanced hardness to an acceptable level for some biomedical applications.
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U2 - 10.1063/5.0009456
DO - 10.1063/5.0009456
M3 - Article
AN - SCOPUS:85089598825
SN - 2158-3226
VL - 10
JO - AIP Advances
JF - AIP Advances
IS - 5
M1 - 055222
ER -