Investigation of the interaction between hydrogen and irradiation defects in titanium by using positron annihilation spectroscopy |
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Authors: | Xudong An Te Zhu Mingpan Wan Yuanhui Li Qianqian Wang Peng Zhang Jinyang Liu Yamin Song Zhaokuan Zhang Baoyi Wang Xingzhong Cao |
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Affiliation: | 1. College of Materials and Metallurgy, Guizhou University, Guiyang 550025, China;2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;3. Key Laboratory for Material Structure and Strength of Guizhou Province, Guiyang 550025, China |
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Abstract: | The formation of mono-vacancy, vacancy clusters and hydrogen-vacancy complexes with 30 keV H ion-irradiated pure titanium at different doses and temperatures was measured using by Positron annihilation spectroscopy (PAS). Results show a large number of HmVn clusters and vacancy-like defects in the samples irradiated at for room temperature, and that the formation of HmVn (m > n) at the sample irradiated at a high dose inhibits the increase of the S parameter. At increased irradiation temperature, the shrinkage of vacancy clusters and the effective open volume of defects decrease the S parameters. The high-temperature irradiation results in decreased vacancy-type defect concentration, and some hydrogen atoms diffuse from the cascade region to the track region, forming a large number of hydrogen-vacancy complexes in the track region. The coincidence Doppler broadening spectroscopy, an element analysis method, used to detect hydrogen in the ion-irradiated pure titanium sample, and results show hydrogen-related peaks in the high-momentum region, which may be due to the information of positron annihilation in the covalent bond formed by the H and the Ti elements. The increased radiation dose and temperature contribute to the formation of the hydrogen vacancy-complex, and the positron annihilation in high-momentum regions easily obtain hydrogen-related information. |
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Keywords: | Hydrogen Ion irradiation Vacancy-type defect Positron annihilation spectroscopy Titanium |
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