期刊
ACTA MATERIALIA
卷 158, 期 -, 页码 180-192出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2018.07.043
关键词
Intergranular failure; Nickel; Hydrogen embrittlement; Dislocations; Grain boundaries
资金
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA-0003525]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
Uniaxial mechanical testing conducted at room temperature (RT) and 77 K on hydrogen (H)-exposed nickel was coupled with targeted microscopy to evaluate the influence of deformation temperature, and therefore mobile H-deformation interactions, on intergranular cracking in nickel. Results from interrupted tensile tests conducted at cryogenic temperatures (77 K), where mobile H-deformation interactions are effectively precluded, and RT, where mobile H-deformation interactions are active, indicate that mobile H-deformation interactions are not an intrinsic requirement for H-induced intergranular fracture. Moreover, an evaluation of the true strain for intergranular microcrack initiation for testing conducted at RT and 77 K suggests that H which is segregated to grain boundaries prior to the onset of straining dominates the H-induced fracture process for the prescribed H concentration of 4000 appm. Finally, recent experiments suggesting that H-induced fracture is predominately driven by mobile H deformation interactions, as well as the increased susceptibility of coherent twin boundaries to H induced crack initiation, are re-examined in light of these new results. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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