Journal
NATURE MATERIALS
Volume 14, Issue 9, Pages 894-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4335
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Funding
- US DOE Basic Energy Sciences [DE-SC0008677]
- U.S. Department of Energy (DOE) [DE-SC0008677] Funding Source: U.S. Department of Energy (DOE)
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When metallic alloys are exposed to a corrosive environment, porous nanoscale morphologies spontaneously form that can adversely affect the mechanical integrity of engineered structures(1,2). This form of stress-corrosion cracking is responsible for the well-known 'season cracking' of brass and stainless steel components in nuclear power generating stations(3,4). One explanation for this is that a high-speed crack is nucleated within the porous layer, which subsequently injects into non-porous parent-phase material(5). We study the static and dynamic fracture properties of free-standing monolithic nanoporous gold as a function electrochemical potential using high-speed photography and digital image correlation. The experiments reveal that at electrochemical potentials typical of porosity formation(6) these structures are capable of supporting dislocation-mediated plastic fracture at crack velocities of 200 ms(-1). Our results identify the important role of high-speed fracture in stress-corrosion cracking and are directly applicable to the behaviour of monolithic dealloyed materials at present being considered for a variety of applications.
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