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氢损伤是目前材料科学中的一个重大课题,一般认为氢会造成氢脆、发裂、白点等缺陷。在氢损伤机制的研究中,搞清固溶氢以什么形态存在及固溶氢是否会导致钢的晶体缺陷是很有意义的。 正电子湮灭技术可以灵敏地反映材料中晶体缺陷的变化,而且正电子和氢离子具有相同的电荷,从电学性质上可以模拟氢离子,因此正电子湮灭技术可望成为研究氢损伤现象的有力工具。
Hydrogen damage is a major issue in the material science, hydrogen is generally believed to cause hydrogen embrittlement, cracking, white spots and other defects. In the study of hydrogen damage mechanism, it is significant to find out what form of solid solution hydrogen exists and whether solid solution hydrogen can cause crystal defects of steel. Positron annihilation techniques can sensitively reflect the change of crystal defects in the material, and positrons and hydrogen ions have the same charge, which can simulate hydrogen ions from the electrical properties. Therefore, positron annihilation technique is expected to be a powerful tool for studying hydrogen damage phenomena .