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

Journal Article · · Nature Materials

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.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1507375
Report Number(s):
PNNL-SA-138538
Journal Information:
Nature Materials, Vol. 17, Issue 10; ISSN 1476-1122
Publisher:
Springer Nature - Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 43 works
Citation information provided by
Web of Science

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Cited By (3)

Bi-continuous pattern formation in thin films via solid-state interfacial dealloying studied by multimodal characterization journal January 2019
Computational modeling of pitting corrosion journal September 2019
Topology evolution during coarsening of nanoscale metal network structures text January 2019