The effect of hydrogen on vacancy generation in iron by plastic deformation

• Published in: Scripta materialia Vol. 55; no. 11; pp. 1031 - 1034
• Main Authors: Sakaki, K., Kawase, T., Hirato, M., Mizuno, M., Araki, H., Shirai, Y., Nagumo, M.
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Ltd 01-12-2006; Elsevier Science
• Subjects: Applied sciences; Exact sciences and technology; Ferritic iron; Fractures; Hydrogen embrittlement; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Positron lifetime; Vacancy; Positron lifetime; Vacancy; Ferritic iron; Hydrogen embrittlement; Lifetime; Hydrogen; Rupture; Mechanical properties; Plastic deformation
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2006.08.030

Positron lifetime spectroscopy was applied to examine the synergistic effect of hydrogen and plastic straining on the vacancy generation in iron. Hydrogen enhanced the increase in mean positron lifetime,
τ
m, by plastic straining and elevated the recovery temperature of
τ
m on isochronal annealing. Multi-component analyses of positron lifetime spectra showed that the presence of hydrogen enhances the generation of vacancies, rather than of dislocations. These results are consistent with previous interpretations on thermal desorption analysis of hydrogen in deformed steels.