FCC phase formation in immiscible Mg-Hf (magnesium-hafnium) system by high-pressure torsion

Edgar Ignacio López Gómez, Kaveh Edalati, Diego Davi Coimbrão, Flávio José Antiqueira, Guilherme Zepon, Jorge M. Cubero-Sesin, Walter José Botta

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4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number055222
JournalAIP Advances
Volume10
Issue number5
DOIs
Publication statusPublished - May 1 2020

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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