Effect of the strain rate on stress corrosion crack velocities in face-centred cubic alloys. A mechanistic interpretation

Serebrinsky, Santiago; Galvele, J.R.

doi:10.1016/s0010-938x(03)00172-0

Cited by 26 publications

(12 citation statements)

References 28 publications

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“…Recently we published a micrograph of a dealloyed layer formed on a 95Ag-5Au (at.%) alloy, not showing nanoporosity (this was not resolved) but showing a well-adhered, albeit cracked, surface layer (3). In part, the publication of this image - Figure 1 -was prompted by an assertion by the group of J.R. Galvele (4,5) that stress corrosion cracking (SCC) of AgAu alloys with low Au contents could not involve dealloying. Figure 1 De-alloyed layer formed on an unstressed 95Ag-5Au (a/o) alloy in 0.77 M HClO 4 at 20°C.…”

Section: Introductionmentioning

confidence: 99%

Distribution of the Retained Less-Noble Element in Dealloyed Materials

Artymowicz¹,

Coull²,

Bryk³

et al. 2011

ECS Trans.

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Electrolytic dealloying of a solid-solution alloy is usually understood to involve a relatively large content of more-noble element in the alloy (e.g. 25%), from which starting point it is natural that dealloying will produce a connected nanoporous structure. But it has been known for a long time, since the work of H.W. Pickering, that starting alloys such as Cu-10 at.% Au can be dealloyed to produce fully connected Au-rich dealloyed layers, at least to a certain thickness. Clearly not all the Cu could have been removed during this process, and Pickering demonstrated not only that the dealloyed material retained much of its Cu, but that there was a compositional gradient, or at least a range of dealloyed compositions, within the material. In the present work we have used a 95Ag-5Au (at.%) alloy and have attempted to correlate the dealloying behaviour (ligament size in the nanoporous layer; true surface area) with Kinetic Monte Carlo simulations of the dealloying process. The results are analogous, with some areas for further quantitative development. A related behaviour in stainless steels is discussed.

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Section: Introductionmentioning

confidence: 99%

Distribution of the Retained Less-Noble Element in Dealloyed Materials

Artymowicz¹,

Coull²,

Bryk³

et al. 2011

ECS Trans.

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“…Both chemical and mechanical processes have been postulated as the reason for this rupture. Various studies were carried out to examine the SR effect on the strength of these construction materials [2,[5][6][7][8][9][10][11]. Much of the experimental work was done with the use of slow strain rate tests (SSRT).…”

Section: Introductionmentioning

confidence: 99%

The effect of strain rate on the passive layer cracking of 304L stainless steel in chloride solutions based on the differential analysis of electrochemical parameters obtained by means of DEIS

Orlikowski¹,

Darowicki²,

Arutunow³

et al. 2005

Journal of Electroanalytical Chemistry

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“…We are obliged to address the claims made by Serebrinsky and Galvele [31] regarding the very fast crack growth rates seen in our experiments (which are admitted by those authors based on their own data, although we believe we can approach one order of magnitude faster than their quoted 20 mm/s). Reference 31 is one of the more recent articles to propose that SCC in a wide range of metals and alloys is caused by capture of surface vacancies by the crack tip; surface reactions are supposed to alter the surface self-diffusivity of the metal.…”

Section: A the Surface Mobility Modelmentioning

confidence: 60%

“…According to Serebrinsky and Galvele, [31] crack growth rates in Ag-15Au of up to 20 mm/s at strain rates of up to 18 s -1 can all be accommodated within the surface mobility model. According to the filminduced cleavage model, these ''crack growth rates'' simply reflect the depth of the initially injected crack divided by the time to failure of the sample.…”

Section: A the Surface Mobility Modelmentioning

confidence: 99%

Film-Induced Cleavage of Ag-Au Alloys

Barnes

Senior

Newman

2008

Metall Mater Trans A

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Single-shot fracture experiments have been carried out in a dealloying environment (perchloric acid) on Ag-20 at. pct Au and Ag-23 at. pct Au alloys in the form of thin wire and foil, respectively. Such environments produce a nanoporous metallic layer on the surface. Transgranular fracture was promoted in some of the wire experiments by inducing a bamboo grain structure. Using the wires, it was shown that complete brittle intergranular or transgranular fracture could be obtained, either by applying a very low tensile stress during dealloying, by rapidly straining the wire after dealloying without stress, or by straining to failure after first dropping the potential to a value where little or no further faradaic reaction was possible. Extremely low fracture stresses were found, especially for intergranular fracture, and all fracture events were sudden with no secondary substrate fracture. The work with foils showed that some irreproducibility noted in the response of the wires was associated with premature self-fracture of the dealloyed layer. By optimizing the condition of the dealloyed layer, extremely reproducible and complete film-induced fractures were obtained. These dealloyed layers showed properties not previously seen, such as an ability to inject deep substrate cracks even after a 5-minute immersion in deionized water. Recent studies showing extraordinary mechanical properties of dealloyed layers, such as near-theoretical strength in compression, give more credibility to this still-mysterious fracture mechanism. A detailed rebuttal of the claims of the alternative ''surface mobility'' model is presented.

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Effect of the strain rate on stress corrosion crack velocities in face-centred cubic alloys. A mechanistic interpretation

Cited by 26 publications

References 28 publications

Distribution of the Retained Less-Noble Element in Dealloyed Materials

Distribution of the Retained Less-Noble Element in Dealloyed Materials

The effect of strain rate on the passive layer cracking of 304L stainless steel in chloride solutions based on the differential analysis of electrochemical parameters obtained by means of DEIS

Film-Induced Cleavage of Ag-Au Alloys

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