The influence of hydrogen on defect structure in pure titanium was systemically investigated using X-ray diffraction (XRD) and positron annihilation spectroscopy (PAS). The results showed that hydrogen damage was related to hydrogen concentration, and PAS provided a new idea for the study in the formation of hydride and open volume defects. XRD results showed that two types of titanium hydrides were observed in hydrogen-charged samples, i.e., δ-TiH_x and ε-TiH₂, and the degree of lattice expansion and the content of hydride increased with hydrogen content. The variation of the S parameter and W parameter indicated that a great deal of vacancy-type defects formed during electrochemical hydrogen charging, and hydrogen atoms could combine with vacancy to form a certain amount of hydrogen-vacancy complexes (H_nV_m), meanwhile, the hydrogen damage varied significantly with depth. The effective open volume of vacancy-type defect increased with hydrogen charging concentration, and hydrogen-vacancy cluster transformed into H_nV_m (n < m) cluster, vacancy defects were gradually dominated. In addition, According to the different annihilation environment of positron in titanium hydrides and hydrogen-vacancy complexes, the existence of titanium hydrides and the existing form of hydrogen in defect could be identified in Doppler broadening spectroscopy (CDB). This provided a new way to identify the formation of hydrides and to detect the existing form of low concentration hydrogen in samples.

使用X射线衍射（XRD）和正电子湮没光谱（PAS）系统地研究了氢对纯钛缺陷结构的影响。结果表明，氢损伤与氢浓度有关，PAS为研究氢化物和开放体积缺陷的形成提供了新思路。XRD结果表明在充氢样品中观察到两种氢化钛，即δ-TiH _x和ε-TiH ₂, 晶格膨胀程度和氢化物含量随氢含量的增加而增加。S参数和W参数的变化表明电化学充氢过程中形成了大量的空位型缺陷，氢原子可以与空位结合形成一定量的氢空位络合物（H _n V _m），同时，氢损伤随深度变化显着。空位型缺陷的有效开放体积随着充氢浓度的增加而增加，氢空位簇转变为H _n V _m ( n  <  m) 簇，空位缺陷逐渐占优势。此外，根据氢化钛和氢空位络合物中正电子的湮没环境不同，多普勒展宽光谱（CDB）可以识别氢化钛的存在和缺陷中氢的存在形式。这为识别氢化物的形成和检测样品中低浓度氢的现有形式提供了一种新方法。