Hydrogen Storage, Microstructure and Mechanical Properties of Strained Mg₆₅Ni₂₀Cu₅Y₁₀ Metallic Glass

Abstract:

Melt-spun amorphous Mg₆₅Ni₂₀Cu₅Y₁₀ metallic glass compacts were subjected to severe shear deformation by high-pressure torsion. High-resolution X-ray diffraction analysis and scanning electron microscopy revealed that high-pressure torsion resulted in a deformation dependent microstructure. Nanoindentation measurements indicated that the heavy shear deformation yields an increase in hardness. High-pressure calorimetry measurements revealed that hydrogen uptake in the fully amorphous alloy occurs at a significantly lower temperature compared to the fully crystallized state, while the amount of absorbed hydrogen increased considerably after shear strain due to the formation of Mg₂Ni crystals.

• Periodical: Materials Science Forum (Volume 729)
• Pages: 74-79
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.729.74
• Online since: November 2012
• Authors: Adam Revesz, Ágnes Kis-Tóth, Péter Szommer, Tony Spassov
• Keywords: Amorphous Alloy, High-Pressure Torsion, H-Storage, Mg-Based

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