Journal
ACTA MATERIALIA
Volume 60, Issue 6-7, Pages 2739-2745Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2012.01.040
Keywords
Hydrogen embrittlement; Intergranular cracking; Transmission electron microscopy; Scanning electron microscopy; Nickel
Funding
- DOE EERE [GO15045]
- University of Illinois Satellite Center of the International Institute for Carbon Neutral Energy Research (I2CNER)
- Japanese Ministry of Education, Culture, Sports, Science and Technology
- Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, US Department of Energy [DE-AC02-05CH11231]
- US Department of Energy [DE-AC04-94AL85000]
- National Science Foundation
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Using a combination of high-resolution scanning and transmission electron microscopy, the basic mechanisms of hydrogen-induced intergranular fracture in nickel have been revisited. Focused-ion beam machining was employed to extract samples from the fracture surface to enable the examination of the microstructure immediately beneath it. Evidence for slip on multiple slip systems was evident on the fracture surface; immediately beneath it, an extensive dislocation substructure exists. These observations raise interesting questions about the role of plasticity in establishing the conditions for hydrogen-induced crack initiation and propagation along a grain boundary. The mechanisms of hydrogen embrittlement are re-examined in light of these new results. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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