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Title: Decoupling the role of stress and corrosion in the intergranular cracking of noble-metal alloys

Abstract

Intergranular stress-corrosion cracking (IGSCC) is a form of environmentally induced crack propagation causing premature failure of elemental metals and alloys. It is believed to require the simultaneous presence of tensile stress and corrosion; however, the exact nature of this synergy has eluded experimental identification. For noble metal alloys such as Ag–Au, IGSCC is a consequence of dealloying corrosion, forming a nanoporous gold layer that is believed to have the ability to transmit cracks into grain boundaries in un-dealloyed parent phase via a pure mechanical process. Here using atomic-scale techniques and statistical characterizations for this alloy system, we show that the separate roles of stress and anodic dissolution can be decoupled and that the apparent synergy exists owing to rapid time-dependent morphology changes at the dealloyed layer/parent phase interface. We discuss the applicability of our findings to the IGSCC of important engineering Fe- and Ni-based alloys in critical applications.

Authors:
 [1];  [1];  [2];  [2];  [2];  [1];  [1];  [2];  [1]
  1. Ira A. Fulton School of Engineering, Arizona State University, Tempe, Arizona, United States
  2. Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, United States
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1490318
DOE Contract Number:  
SC0008677; AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Nature Materials
Additional Journal Information:
Journal Volume: 17; Journal Issue: 10; Journal ID: ISSN 1476-1122
Country of Publication:
United States
Language:
English

Citation Formats

Badwe, N., Chen, X., Schreiber, D. K., Olszta, M. J., Overman, N. R., Karasz, E. K., Tse, A. Y., Bruemmer, S. M., and Sieradzki, K. Decoupling the role of stress and corrosion in the intergranular cracking of noble-metal alloys. United States: N. p., 2018. Web. doi:10.1038/s41563-018-0162-x.
Badwe, N., Chen, X., Schreiber, D. K., Olszta, M. J., Overman, N. R., Karasz, E. K., Tse, A. Y., Bruemmer, S. M., & Sieradzki, K. Decoupling the role of stress and corrosion in the intergranular cracking of noble-metal alloys. United States. doi:10.1038/s41563-018-0162-x.
Badwe, N., Chen, X., Schreiber, D. K., Olszta, M. J., Overman, N. R., Karasz, E. K., Tse, A. Y., Bruemmer, S. M., and Sieradzki, K. Mon . "Decoupling the role of stress and corrosion in the intergranular cracking of noble-metal alloys". United States. doi:10.1038/s41563-018-0162-x.
@article{osti_1490318,
title = {Decoupling the role of stress and corrosion in the intergranular cracking of noble-metal alloys},
author = {Badwe, N. and Chen, X. and Schreiber, D. K. and Olszta, M. J. and Overman, N. R. and Karasz, E. K. and Tse, A. Y. and Bruemmer, S. M. and Sieradzki, K.},
abstractNote = {Intergranular stress-corrosion cracking (IGSCC) is a form of environmentally induced crack propagation causing premature failure of elemental metals and alloys. It is believed to require the simultaneous presence of tensile stress and corrosion; however, the exact nature of this synergy has eluded experimental identification. For noble metal alloys such as Ag–Au, IGSCC is a consequence of dealloying corrosion, forming a nanoporous gold layer that is believed to have the ability to transmit cracks into grain boundaries in un-dealloyed parent phase via a pure mechanical process. Here using atomic-scale techniques and statistical characterizations for this alloy system, we show that the separate roles of stress and anodic dissolution can be decoupled and that the apparent synergy exists owing to rapid time-dependent morphology changes at the dealloyed layer/parent phase interface. We discuss the applicability of our findings to the IGSCC of important engineering Fe- and Ni-based alloys in critical applications.},
doi = {10.1038/s41563-018-0162-x},
journal = {Nature Materials},
issn = {1476-1122},
number = 10,
volume = 17,
place = {United States},
year = {2018},
month = {9}
}

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    Works referencing / citing this record:

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