The stress corrosion cracking of AgAu alloys—I. 1 M perchloric acid solution

Maier, I. A.; Fernandez, Sammie; Galvele, J.R.

doi:10.1016/0010-938x(94)00099-r

Cited by 20 publications

(6 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This could be important for stress corrosion cracking (SCC), where only a few tens of nm of a nanoporous layer may be required to trigger a crack advance event (8). Maier et al (6) had a very different view of the mechanism of SCC from the present authors, but did show slight SCC down to 50% Ag -one might attribute this to slow porosity formation 'below' the parting limit, or perhaps to a change in the kinetics of de-alloying at a surface with dynamic plasticity.…”

Section: Resultscontrasting

confidence: 81%

Insights into the Parting Limit for De-Alloying from Reconsideration of Atomistic Considerations

2007

View full text Add to dashboard Cite

The parting limit for de-alloying of a homogeneous binary alloy is usually slightly above 50 at.% of the more reactive alloy component. The system that has been most studied, silver-gold, shows a parting limit close to 55 at.% silver. Kinetic Monte Carlo simulations suggest that such a parting limit is determined by a high-density site percolation threshold for the fcc lattice. Percolation paths are established by silver atoms that have a particular number and arrangement of like neighbors, enabling dealloying to occur without having to dissolve silver atoms with more than nine total neighbors. The actual geometrical threshold, in the absence of surface diffusion, is 58.1 ± 0.4%. With realistic kinetics of surface diffusion for a gold-based system, the parting limit drops to 54.6 ± 0.6%, since a few otherwise inaccessible dissolution paths are opened up by surface diffusion of gold.

show abstract

Section: Resultscontrasting

confidence: 81%

Insights into the Parting Limit for De-Alloying from Reconsideration of Atomistic Considerations

2007

View full text Add to dashboard Cite

show abstract

“…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%

“…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. The layer was grown by applying an anodic current density of 5 mA/cm 2 for 300 s. We can see that a well-defined layer is formed, even at this low Au content.…”

Section: Introductionmentioning

confidence: 99%

Distribution of the Retained Less-Noble Element in Dealloyed Materials

Artymowicz¹,

Coull²,

Bryk³

et al. 2011

ECS Trans.

View full text Add to dashboard Cite

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.

show abstract

“…The dealloying or selective deletion of Ag from Ag-Au alloys with oxidative etchants such as nitric acid or perchloric acid has been widely used to synthesize nanoporous gold (NPG) [18][19][20][21] …”

Section: Introductionmentioning

confidence: 99%

Formation of substrate-based gold nanocage chains through dealloying with nitric acid

Yan¹,

Wu²,

Di³

2016

Nano Online

View full text Add to dashboard Cite

Metal nanocages have raised great interest because of their new properties and wide applications. Here, we report on the use of galvanic replacement reactions to synthesize substrate-supported Ag-Au nanocages from silver templates electrodeposited on transparent indium tin oxide (ITO) film coated glass. The residual Ag in the composition was dealloyed with 10% nitric acid. It was found that chains of Au nanocages were formed on the substrate surface during dealloying. When the concentration of HNO 3 increased to 20%, the structures of nanocages were damaged and formed crescent or semi-circular shapes. The transfer process on the substrate surface was discussed.1362

show abstract

The stress corrosion cracking of AgAu alloys—I. 1 M perchloric acid solution

Cited by 20 publications

References 13 publications

Insights into the Parting Limit for De-Alloying from Reconsideration of Atomistic Considerations

Insights into the Parting Limit for De-Alloying from Reconsideration of Atomistic Considerations

Distribution of the Retained Less-Noble Element in Dealloyed Materials

Formation of substrate-based gold nanocage chains through dealloying with nitric acid

Contact Info

Product

Resources

About