Abstract
The Zr65Al10Ni10Cu15 amorphous ribbon and bulk samples were prepared by the single roller melt-spinning technique and the copper-mold casting, respectively. The hydrogen absorption properties of the ribbon and bulk samples were evaluated at 473 and 523K under 4MPa using a Sieverts-type apparatus. For both ribbon and bulk samples, the hydrogen absorption kinetics increase with the increase of temperature, and the hydrogen concentration approaches the saturation value of 0.7 and 0.8wt.% at 473 and 523K, respectively. The electrical resistivity of the hydrogenated sample decreases with the increasing temperature with a negative slope, similar as the melt-spun sample. The electrical resistivity increases with the increasing hydrogen content in the amorphous sample mainly due to the diffraction effect from the absorbed hydrogen atoms. The electrical resistivities of the sample with of 0.8wt.% H are 294μΩ·cm at 293K and 316μΩ·cm at 5K. The compressive strength of the bulk amorphous alloy is not changed apparently by the absorbed hydrogen. However, the plastic deformation decreases from 3.2% for the as-cast bulk sample to 1.3% for the sample with 0.8wt.% H due to the lower free volume after the hydrogenation. The hardness value enlarges slightly with the increase of hydrogen content.
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