Effect of Hydrogen-charging on the Structure of Bulk Amorphous Alloy
“Hydrogen in metals” has been a popular topic for material scientists and engineers for many decades. One of the main reasons is the infamous ability of hydrogen to degrade the mechanical properties of most metallic materials. Another reason is the potential of using metal hydrides for hydrogen storage materials. Bulk metallic glasses (BMGs) are emerging engineering materials which exhibit many unique material properties due to its glassy structure.
Recently, some of the BMGs have drawn considerable attention for their potential as hydrogen purification and separation membranes. Since properties are strongly affected by the microstructure of the alloys, we used synchrotron xray PDF analyses and Inelastic Neutron Scattering (INS) to investigate the effect of hydrogen on the structure of a hydrogenated BMG. PDF is, by far, the most effective way to systematically describe the structure of an amorphous material, and neutron scattering is among a few techniques that can directly probe hydrogen atoms inside bulk alloys. Combining PDF and INS techniques, the local atomic environment of hydrogen and the corresponding structure changes of BMG are examined comprehensively.