In-situ microscale examination of hydrogen effect on fracture toughness: A case study on B2 and D03 ordered iron aluminides intermetallic alloys
| Autor: | Yun Deng, Bjørn Rune Sørås Rogne, Afrooz Barnoush |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Hydrogen Mechanical Engineering 0211 other engineering and technologies Intermetallic chemistry.chemical_element FEAL 02 engineering and technology Cracking 020303 mechanical engineering & transports Fracture toughness 0203 mechanical engineering chemistry Mechanics of Materials Fracture (geology) General Materials Science Composite material Microscale chemistry 021101 geological & geomatics engineering Hydrogen embrittlement |
| Zdroj: | Engineering Fracture Mechanics. 217:106551 |
| ISSN: | 0013-7944 |
| DOI: | 10.1016/j.engfracmech.2019.106551 |
| Popis: | The hydrogen embrittlement phenomenon of iron aluminides (Fe3Al and FeAl) at microscale was investigated by microcantilevers bending tests with a (1 0 0)[0 0 1] crack system. The cantilevers were loaded in-situ in an environmental scanning electron microscope under two conditions: one with water vapor to promote hydrogen uptake and the other one with high vacuum as a reference state. Fe3Al shows a distinguished cleavage fracture behavior when tested under both conditions. The microscale fracture toughness of Fe3Al was evaluated by linear elastic fracture mechanics and the basic J-integral method. FeAl, however, exhibited a stable cracking behavior and thus the fracture toughness was characterized using iterative J-integral method. For both materials, the hydrogen is found to reduce the maximum bearing load and enhance the cracking process. |
| Databáze: | OpenAIRE |
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