Stress corrosion cracking of alpha brass in a tarnishing ammoniacal environment: Fractography and chemical analysis

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

doi:10.1007/bf02641959

Cited by 32 publications

(8 citation statements)

References 9 publications

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“…Vacancies produced by anodic dissolution reduce the interatomic bond density at the surface region, causing dislocation nucleation and out-of-surface displacement. It has been reported that extensive brass dealloying occurs on stressed surfaces, [36][37] and recently, more direct evidence of anodic generation of vacancies has been provided. 38 Further more, there is previous evidence indicating a decrease in the activation energy for plastic deformation and easier yielding under dissolution conditions due to corrosion-induced vacancies.…”

Section: Proposed Environment-induced Deformation Localization Mechanismmentioning

confidence: 98%

Environment-Induced Deformation Localization During Transgranular Stress Corrosion Cracking

Lian

Meletis

1996

CORROSION

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The nucleation and evolution of deformation patterns occurring during transgranular stress corrosion cracking (TGSCC) were studied in an attempt to produce new alternatives for addressing the nature of the embrittlement process. Flat, tensile α-brass (72% Cu-28% Zn) specimens were tested in 5 M aqueous ammonia (NH 4 OH) solution at a strain rate of 1 x 10 -5 /s. Slip-band spacing (SBS) and slip-band height (SBH) were measured as a function of strain by conducting interrupted experiments in the SCC environment and were compared with those developed during laboratory air experiments. The presence of the TGSCCcausing environment during straining promoted localized plastic deformation at the near-surface region and, more importantly, produced an entirely different deformation pattern from that developed in laboratory air. The deformation evolved in the presence of the TGSCC electrolyte was highly localized, exhibiting small SBS but large SBH. Also, a periodicity was exhibited by the crack initiation process. The amount of localized strain developed at the specimen near-surface region before nucleation of stress corrosion cracks was found to be equivalent to the strain required for ductile fracture of the material in air, suggesting the existence of a fundamental fracture criterion. Grounds for an environment-induced deformation localization mechanism were introduced to explain the phenomenology of TGSCC initiation and propagation.

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Section: Proposed Environment-induced Deformation Localization Mechanismmentioning

confidence: 98%

Environment-Induced Deformation Localization During Transgranular Stress Corrosion Cracking

Lian

Meletis

1996

CORROSION

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“…In the SCC tests, the specimens were covered with a black tarnish film, which is well known to be a thick brittle copper oxide (Cu 2 O) that causes intergranular SCC under tensile stress [48][49][50]. In Cu-Zn alloys with less than 20 wt% Zn, intergranular SCC tends to occur, whereas alloys with more than 20 wt% Zn tend to exhibit transgranular SCC [51,52].…”

Section: Resultsmentioning

confidence: 99%

Effect of Grain Size on the Stress Corrosion Cracking of Ultrafine Grained Cu-10 wt% Zn Alloy in Ammonia

Asabe

Rifai

Yuasa

et al. 2017

International Journal of Corrosion

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The effect of grain size in the micron to submicron range on the stress corrosion cracking (SCC) of Cu-10 wt% Zn alloys was investigated using constant-load tests in ammonia vapor. The grain size was systematically varied from 4 m to 0.12 m by either cold-rolling or equal-channel angular pressing (ECAP), followed by annealing. The time to fracture increased with decreasing grain size above 1 m but then began to decrease with decreasing grain size into the submicron range. This inverse trend in the submicron range is discussed in terms of a severe plastic deformation-(SPD-) induced ultrafine grain microstructure.

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“…Auger analysis by other workers (9) suggests that it contains significant amounts of zinc. Electron microprohe studies of the thick precipitated layers formed on Cu-Zn (and Cu-Al and Cu-Ni alloys) established that , in contrast , the Cu 2 0 is essentially depleted with respect to zinc (and the other alloy ing elements), consistent with the view that these layers are formed by a dissolution-reprecipitation mechanism (10,11).…”

Section: (1)mentioning

confidence: 93%

Mechanism of Stress-Corrosion Cracking.

Pugh¹

1977

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Stress corrosion cracking of alpha brass in a tarnishing ammoniacal environment: Fractography and chemical analysis

Cited by 32 publications

References 9 publications

Environment-Induced Deformation Localization During Transgranular Stress Corrosion Cracking

Environment-Induced Deformation Localization During Transgranular Stress Corrosion Cracking

Effect of Grain Size on the Stress Corrosion Cracking of Ultrafine Grained Cu-10 wt% Zn Alloy in Ammonia

Mechanism of Stress-Corrosion Cracking.

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