Ti-6Al-4V合金之氧化膜對氫滲透之影響

Effects of the Oxide Film on Hydrogen Absorption in Ti-6Al-4V Alloy

本研究的目的，在探討Ti-6Al-4V合金經不同氧化處理下所長的氧化膜對抑制滲氫的效果評估，研究顯示，在高溫下基材的鋁往外擴散，使得氧化層與基材間將留下空孔（vacancy）進而形成孔洞（void）因此形成氫陷阱（hydrogen trap）。複合型氧化鈦層的存在與否，其厚薄與緻密性的好壞為決定抑制滲氫效果好壞的最主要因素。

Effects of oxide films on the hydrogen absorption behavior of Ti-6Al-4V at various oxidation conditions were investigated in this study. The results show that hydrogen traps formed at the titanium-oxide/substrate interface are due mainly to the outward diffusion of aluminum at elevated temperatures in which the formation of vacancies or voids is favorable. The main factors to determine the ability of the hydrogen absorption in the alloy are strongly dependent on the presence of mixed oxide films as well as their thickness and compactness.