Review of Positron Lifetime Studies of Lattice Defects Formed during Tensile Deformation in a Hydrogen Environment

• Sugita Kazuki

  Center for Atomic and Molecular Technologies, Graduate School of Engineering, Osaka University

• Mizuno Masataka

  Center for Atomic and Molecular Technologies, Graduate School of Engineering, Osaka University

• Araki Hideki

  Center for Atomic and Molecular Technologies, Graduate School of Engineering, Osaka University

• Shirai Yasuharu

  Professor Emeritus, Osaka University. Professor Emeritus, Kyoto University.

• Omura Tomohiko

  Steel Research Laboratories, Nippon Steel Corporation

• Tomatsu Kota

  Advanced Technology Research Laboratories, Nippon Steel Corporation

• Sakiyama Yuji

  Steel Research Laboratories, Nippon Steel Corporation

抄録

The lattice defects, especially vacancies, formed during tensile deformation in a hydrogen environment have been evaluated by positron annihilation lifetime spectroscopy (PALS). The results from several such evaluations in previous studies in hydrogen-charged iron, steels, and Ni-based alloys are reviewed in this study with reference to hydrogen embrittlement models. A strong tendency to increase the positron lifetime for the vacancy cluster component, that is, the larger the vacancy cluster size, the lower the fracture strains, was found in many PALS studies on tensile-deformed metals. This suggests that plastic strain localization, a characteristic feature of hydrogen embrittlement, is consistent with hydrogen-enhanced vacancy clustering during plastic deformation. Early studies suggested that hydrogen precharging would result in a significant increase in the vacancy density, as inferred from the hydrogen content obtained from thermal desorption analysis (TDA). However, recent PALS studies have been negative, as no significant increase in vacancy density were observed.

収録刊行物

• ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ

  ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ 61 (4), 1056-1063, 2021-04-15

  一般社団法人 日本鉄鋼協会

キーワード

• hydrogen embrittlement
• vacancy
• lattice defects
• positron annihilation lifetime spectroscopy

詳細情報

• CRID: 1390850646114113792
• NII論文ID: 130008024800
• DOI: 10.2355/isijinternational.isijint-2020-550
• ISSN: 13475460
• ISSN: 09151559
• Web Site: https://www.jstage.jst.go.jp/article/isijinternational/61/4/61_ISIJINT-2020-550/_pdf
• 本文言語コード: en
• データソース種別:
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