Ti-Mo互扩散界面吸氢同位素效应的离子束分析研究  

Ion Beam Analysis of Hydrogen Isotope Effect at Ti-Mo Interdiffusion Interface

作　　者：段一鸣 李聪 张伟光[2] 王猛 施立群[1] DUAN Yiming;LI Cong;ZHANG Weiguang;WANG Meng;SHI Liqun(Institute of Modern Physics,Fudan University,Shanghai 200082,China;Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]复旦大学现代物理研究所,上海200082 [2]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《原子能科学技术》2022年第10期2178-2186,共9页Atomic Energy Science and Technology

摘　　要：为探究Ti-Mo互扩散对金属吸氢的影响,本文采用离子束分析方法对Ti-Mo薄膜的膜-基互扩散界面的吸氢同位素(H和D)效应进行了研究。通过氩离子刻蚀减薄的方法有效降低了表面碳、氧杂质对样品吸氢的影响。吸氢结果表明,对于表面洁净的样品,氢化后固相中氢或氘的浓度均沿着深度随钼原子含量的增加而减小。在单一气体吸氢实验中,氢原子浓度减小的趋势较氘原子缓慢;而在氢氘混合气体吸氢实验中,当容器中的氢氘压强比p(H_(2))∶p(D_(2))≥0.5∶1时,固体中氘氢浓度之比随钼浓度的增加而降低,但当p(H_(2))∶p(D_(2))<0.5∶1时,氘氢浓度之比随钼浓度的增加而升高。因此,由于Ti-Mo界面的互扩散,吸氢出现了显著的氢同位素效应,钼的存在不利于体系对氢同位素气体的吸收。In order to explore the effect of Ti-Mo interdiffusion on metal hydrogen absorption,hydrogen absorption isotope effects at the Ti-Mo alloy due to the interdiffusion at interface were investigated by using ion beam analysis(IBA)which is a non-destructive testing method.A Ti film of a few microns was deposited on a Mo substrate using a vacuum evaporation coating method,and interdiffusion layers appeared at the Ti-Mo interface.The results indicate that there is a single gradient of elemental Ti or Mo concentration across the interdiffusion layer.Physical phase analyses show that Mo is substituted for Ti and exists as a solid solution.The effect of surface carbon(C)and oxygen(O)impurities on hydrogen(H)and deuterium(D)absorption was reduced by the argon ion sputtering thinning method.The presence of O below the detection limit and a small amount of C on the surface of the sample after sputter thinning have a minimal effect on hydrogen absorption.At the same time,the interdiffusion interface is brought closer to the surface.Hydrogen absorption experiments were carried out in an ultrahigh vacuum device.Both single and mixed absorption experiments for H_(2) and D_(2) were conducted,and the samples were analyzed by IBA.The results show that for the samples with clean surfaces,the distribution of hydrogen and deuterium in the solid phase decreases with the increase of molybdenum concentration after absorption of either hydrogen or deuterium gas.This is because that the presence of Mo reduces the bonding ability between the Ti atoms and interstitial H/D atoms,resulting in an increase in the equilibrium pressure of hydrogen/deuterium absorption and a decreased amount of hydrogen absorption.Moreover,the hydrogen concentration tends to decrease more slowly than the deuterium concentration with the increase of depth(i.e.the increase of Mo concentration).When Mo concentration in Ti is greater than 10%,the decrease in lattice constant leads to the reduction of lattice clearance volume.So hydrogen with smaller radius is more like

关 键 词：Ti-Mo 互扩散界面 同位素效应 离子束分析 

分 类 号：TG111.6[金属学及工艺—物理冶金] O571.4[金属学及工艺—金属学]