Hydrogen-Related Properties of the Pd71.5Cu12Si16.5 Metallic Glass

The Pd_71.5Cu₁₂Si_16.5 metallic glass was synthesized as wide ribbons by arc melting and copper roller spinning. The structures were determined by X-ray diffraction patterns using the conventional X-ray diffractometer and short wavelength X-ray stress analyzer, and the fully glassy state of the ribbons is confirmed. Multiple hydrogen absorption and desorption cycles at room temperature under 100 kPa were carried out on the samples. No destruction after more than 10 cycles is observed, which demonstrates good hydrogen embrittlement resistance. The hydrogen permeation properties of the Pd_71.5Cu₁₂Si_16.5 metallic glass and its crystallized counterpart were further tested using a direct permeation method. In the supercooled liquid region, the hydrogen permeation rate is obviously higher for the metallic glass form, which could be explained by the increasing free volumes introduced during isothermal stage in this range.