Abstract
Hydrogen effects on small-volume plasticity and elastic stiffness constants are investigated with nanoindentation of Ni-201 and sonic velocity measurements of bulk Ni single crystals. Elastic modulus of Ni-201, calculated from indentation data, decreases ~ 22% after hydrogen charging. This substantial decrease is independently confirmed by sonic velocity measurements of Ni single crystals; c44 decreases ~ 20% after hydrogen exposure. Furthermore, clear hydrogen–deformation interactions are observed. The maximum shear stress required to nucleate dislocations in hydrogen-charged Ni-201 is markedly lower than in as-annealed material, driven by hydrogen-reduced shear modulus. Additionally, a larger number of depth excursions are detected prior to general yielding in hydrogen-charged material, suggesting cross-slip restriction. Together, these data reveal a direct correlation between hydrogen-affected elastic properties and plastic deformation in Ni alloys.
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Acknowledgements
This work was performed while SKL was affiliated with Sandia National Laboratories and was supported by the DOE NNSA Stewardship Science Graduate Fellowship [Grant DE-NA0002135] and the Laboratory Directed Research and Development program at Sandia National Laboratories [Grant SNL-LDRD-173116], a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under Contract DE-NA-0003525. SAND2018-2771J.
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Lawrence, S.K., Somerday, B.P., Ingraham, M.D. et al. Probing the Effect of Hydrogen on Elastic Properties and Plastic Deformation in Nickel Using Nanoindentation and Ultrasonic Methods. JOM 70, 1068–1073 (2018). https://doi.org/10.1007/s11837-018-2850-z
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DOI: https://doi.org/10.1007/s11837-018-2850-z