Stress corrosion cracking of alpha brass in a nontarnishing ammoniacal environment:fractography and chemical analysis

Pinchback, T. R.; Clough, Stephen P.; Heldt, L. A.

doi:10.1007/bf02656612

Cited by 16 publications

(7 citation statements)

References 7 publications

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“…It has also been confirmed that brass dealloying is more extensive on stressed surfaces as compared to unstressed surfaces [34,37]. Stress-induced rupture of the noble Cu-rich surface film is believed to occur, exposing active brass surface to the environment.…”

Section: Stress-environment Interactionmentioning

confidence: 58%

Deformation evolution during initiation of transgranular stress corrosion cracking

Meletis

Lian

1996

Int J Fract

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Face centered cubic metals and alloys have multiple slip systems and are characterized by high dislocation velocities. Nevertheless, these materials suffer from transgranular stress corrosion cracking (T-SCC), that occurs by environmentally-induced cleavage. Since plasticity precedes fracture in all T-SCC phenomena, the evolution of deformation patterning during T-SCC is an important element of the local microfracture mode. Experimental observations show that the presence of the SCC-causing environment during straining is promoting localized plastic deformation at the near-surface region and producing an entirely different deformation pattern compared with that developing in laboratory air. The deformation evolving in the presence of the SCC electrolyte is highly localized, exhibiting closely spaced, coarse slip bands. The amount of localized strain developing at the nearsurface region prior to nucleation of stress corrosion cracks is equivalent to the strain required for ductile fracture of the material in air, suggesting the existence of a fundamental fracture criterion. The above phenomenology of the deformation evolution is considered in relation to T-SCC initiation and propagation. The T-SCC is suggested to be a macroscopically brittle but microscopically ductile fracture occurring by localized plastic flow. An environmentinduced deformation localization mechanism is described where the role of the environment involves generation of vacancies and subsequent dislocation nucleation from the near-surface region at loads well below those required for normal yielding. The evolution of the localized deformation pattern during T-SCC is suggested to be an outcome of nonuniformity and periodicity in the dissolution process.

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Section: Stress-environment Interactionmentioning

confidence: 58%

Deformation evolution during initiation of transgranular stress corrosion cracking

Meletis

Lian

1996

Int J Fract

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“…In Pugh's nontarnishing solution, Pinchback et al [44] found that the fracture surfaces in a-brass (70/30) were brass colored, and the cleavage-like features extended to the site of crack initiation, thus, characterizing the entire SCC surface and challenging the dissolu tion model proposed before, for this case. Preferential zinc dissolu tion was observed on SCC surfaces; but no evidence was found for oxide formation.…”

Section: Cu^omentioning

confidence: 92%

“…3) Dezincification model: which might produce an embrittled zone at the crack tip, leading to a discontinuous brittle fracture. Dezincification was evident at transgranular stress corrosion fracture surfaces [44].…”

Section: Mechanisms Of Crackingmentioning

confidence: 96%

“…No preferential Zn dissolution was ob served on a macroscopic scale, but the possibility of shallow dezincified layers exists. Pinchback et al [44] provided evidence for dezincification at the transgranular stress corrosion fracture surfaces;…”

Section: Dissolution Processmentioning

confidence: 99%

“…In other solutions, dezincification seems to be a characteristic of the whole surface except at the cracking tip in two solutions, name ly, hydroxide solutions, where the crack tip was Zn-rich, indicating more Cu-dissolution. Pinchback et al [44] observed "preferential Zn dissolution on the SCC surface produced by the nontarnishing solu tion" for a-brass in Pugh's solution. This result is in accordance shown in Table 6.…”

Section: (Nh^)2s0^ + 005 M Cuso^mentioning

confidence: 99%

See 2 more Smart Citations

Electrochemistry of stress corrosion cracking of brass

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The influence of deformation path on the slow strain-rate stress corrosion cracking of admiralty brass sheet

1984

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Stress corrosion cracking of alpha brass in a nontarnishing ammoniacal environment:fractography and chemical analysis

Cited by 16 publications

References 7 publications

Deformation evolution during initiation of transgranular stress corrosion cracking

Deformation evolution during initiation of transgranular stress corrosion cracking

Electrochemistry of stress corrosion cracking of brass

The influence of deformation path on the slow strain-rate stress corrosion cracking of admiralty brass sheet

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