金属/合金材料吸附气体的热脱附研究进展

Research progress of gas atoms thermal desorption from metal/alloys

研究金属/合金材料中气体原子的迁移、聚集和成泡机制,通常以研究微观缺陷捕获气体原子的微观机制为出发点,分析气体原子与缺陷的相互作用,已成为研究材料中气体原子热动力学机制的一个主要课题。热脱附谱仪(thermal desorption spectroscopy,TDS)采用原子质谱分析技术测量材料表面吸附气体的热脱附量随温度变化,获取气体元素原子与空位、位错等微观缺陷的结合能,以及气体原子/气泡的迁移能、热脱附能等热力学参数,从而研究材料中不同微观缺陷捕获气体原子以及气泡形成的微观机理。充分调研了国内外应用TDS技术研究金属/合金材料中气体元素与微观缺陷相互作用机理的最新进展,特别是应用TDS技术研究反应堆结构材料中辐照嬗变气体产物氢/氦与辐照缺陷的相互作用。

During study the gas atom's behavior in metal and alloys,such as migration,diffusion,clustering and formed to bubbles.It is necessary to investigate the capture mechanism of gas atoms with different defects,especially need to analyze the thermodynamic process of atom-defects complexes.Recently,effective experimental method for charactering gas atom's behavior in materials is interested by researchers.One optional experimental technique is the thermal desorption spectroscopy,which can be used to obtain the binding energy of gas atoms with different defects such as vacancy,dislocation and vacancy cluster,and desorption energy of gas atoms with thermodynamic process.Because of desorption temperature can be marked using atomic mass spectrometry,which can detect the desorbed gas atoms.In this paper,the research progress of gas atoms' behavior on metal/alloys using thermal desorption spectrometer is described,especially related to the behavior of hydrogen/helium atoms in the structural materials of nuclear reactor.