Hydrogen trapping behavior at vacancies introduced by electron irradiation with different energy in B2 ordered Fe base alloys
| Autor: | Hori, F., Sumikura, Y., Takano, A., Sugita, K., Ohsawa, K., Qiu, X., Maekawa, Masaki, Kawasuso, Atsuo, Saito, Yuuichi |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Popis: | B2 ordered intermetallic compounds is widely used as a high strength material at high temperature, because of their good properties such as specific strength to weight ratio and oxidation resistance. However, it is also known that corrosion fatigue with hydrogen embrittlement tend to occur for B2 type Fe-Al alloy. Our result of first principle calculation shows that a few hydrogen atoms possibly trapped by one vacancy and its trapping behavior strongly depends on the type of vacancies in some B2 ordered alloys. There are A-type and B-type vacancies in a B2 ordered A-B compound alloy at least. In addition, it is difficult to confirm experimentally which type of vacancy is trapping hydrogen atoms in compound alloys. On this point of view, we have investigated the hydrogen trapping behavior in B2 ordered Fe-Al and Fe-Rh alloys with electron irradiation followed by hydrogen charging and H+ irradiation by positron annihilation techniques, X-ray diffraction and thermal desorption spectrometry (TDS). Also the hardness change was measured for these alloys before and after hydrogen charging. Positron annihilation coincidence Doppler broadening measurement results show that VFe in Fe-Rh and VAl in Fe-Al are dominantly introduced by low energy electron irradiation, and it found from positron lifetime and TDS measurements that hydrogen atoms are trapped by these vacancies introduced by the irradiation. 2019 4th Japan-China Joint Workshop on Positron Science |
| Databáze: | OpenAIRE |
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