Effect of Crack-tip Shielding by Dislocations on Fracture Toughness – in Relation to Hydrogen Embrittlement –
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- Higashida Kenji
- Professor Emeritus, Kyushu University
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- Tanaka Masaki
- Department of Materials, Kyushu University Center for Elements Strategy Initiative for Structural Materials, Kyoto University
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- Sadamatsu Sunao
- Graduate School of Science and Engineering, Kagoshima University
説明
<p>Effect of crack-tip shielding by dislocations is the most fundamental mechanism governing the fracture toughness of crystalline materials. Brittle-to-ductile transition (BDT) caused by increasing temperature is a general phenomenon observed not only in metals and alloys but also in various crystalline materials such as ionic crystals or semiconductors. The increase of fracture toughness in BDT is closely related to the shielding effect due to dislocations multiplied around a crack-tip. The present paper reviews the fundamental theory of crack-tip shielding and its experimental evidence, and also shows the reason why the nature of interatomic bonding has a remarkable influence on macroscopic fracture toughness, based on the shielding theory.</p><p>Hydrogen embrittlement has attracted much attention in the fields of materials science and mechanical engineering although there still remain many arguments on its mechanism. In this paper, the phenomena being characteristic to hydrogen embrittlement are reviewed, and its mechanism is also discussed from the viewpoint of dislocation shielding.</p>
収録刊行物
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- ＩＳＩＪ Ｉｎｔｅｒｎａｔｉｏｎａｌ
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ＩＳＩＪ Ｉｎｔｅｒｎａｔｉｏｎａｌ 62 (10), 2074-2080, 2022-10-15
一般社団法人 日本鉄鋼協会
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詳細情報 詳細情報について
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- CRID
- 1390575274246900096
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- ISSN
- 13475460
- 09151559
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- KAKEN
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可
