Pd71.5Cu12Si16.5金属玻璃的氢相关性能

Hydrogen-related properties of the Pd71.5Cu12Si16.5 metallic glass

摘要:

钯基金属玻璃在氢相关工业中具有潜在的应用价值。在本工作中,我们通过电弧熔炼、铜辊甩带的方法制备了Pd_71.5Cu₁₂Si_16.5 金属玻璃的宽带样品。通过常规X射线衍射仪和短波长X射线应力分析仪的X射线衍射谱确定了样品的完全非晶态结构。在室温、100kPa压力条件下,对样品进行了多次的吸、放氢循环实验。经过10次以上的循环后,样品没有发生破坏,表现出良好的抗氢脆性能。通过气体直接渗透的方法进一步测试了Pd_71.5Cu₁₂Si_16.5 金属玻璃及其同成分晶态合金的氢渗透性能。在金属玻璃的过冷液相区温度范围内,其氢渗透率明显高于晶态相,这一结果由金属玻璃在该区间内的等温保持引入了更多的自由体积进行解释。

Abstract:

Pd-based metallic glasses have potential applications in hydrogen-related industry. In the present study, we synthesized Pd_71.5Cu₁₂Si_16.5 metallic glass as wide ribbons by arc melting and copper roller spinning. Their structures were determined by X-ray diffraction spectra using the conventional X-ray diffractometer and also short wavelength X-ray stress analyzer. Fully glassy state of the ribbons is confirmed. Multiple hydrogen absorption and desorption cycles at room temperature under 100kPa 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 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.