Sulfur segregation on nickel

Miyahara, T.; Stolt, Kaj; Reed, David; Birnbaum, H.K.

doi:10.1016/0036-9748(85)90276-5

Cited by 40 publications

(12 citation statements)

References 7 publications

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“…3, it can be concluded that this behavior is not depended on oxidation time or temperature. The lack of a temperature dependence is uncharacteristic [32], where a higher concentration is expected at the lower temperature [33,34]. The difference between 900 and 1000 8C in this case should be about 15%.…”

Section: Discussionmentioning

confidence: 99%

Compositions at Al2O3/FeCrAl interfaces after high temperature oxidation

Hou¹

2000

Materials and Corrosion

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Section: Discussionmentioning

confidence: 99%

Compositions at Al2O3/FeCrAl interfaces after high temperature oxidation

Hou¹

2000

Materials and Corrosion

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“…The methodology for chalcogenide aerogel formation is simple, comprising three steps: (i) Nanoparticle formation/thiolate capping, (ii) gelation through controlled surface-group loss, and (iii) supercritical CO 2 drying to maintain the pore architecture (17)(18)(19). Both room-temperature reversemicellar strategies (CdS, ZnS, PbS, and CdSe) and high-temperature arrested-precipitation techniques (CdSe) can be employed for nanoparticle production.…”

Section: Porous Semiconductor Chalcogenide Aerogelsmentioning

confidence: 99%

“…Both room-temperature reversemicellar strategies (CdS, ZnS, PbS, and CdSe) and high-temperature arrested-precipitation techniques (CdSe) can be employed for nanoparticle production. The controlled loss of surface groups to reveal reactive sites for nanoparticle condensation is achieved by chemical oxidation of thiolate capping groups (17) or, in the case of CdSe, by photooxidation of the capping groups (20). This step is pivotal for the preparation of porous gel frameworks, because rapid surface-group loss leads to the formation of dense aggregates and precipitation.…”

Section: Porous Semiconductor Chalcogenide Aerogelsmentioning

confidence: 99%

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Grain Boundary Decohesion by Impurity Segregation in a Nickel-Sulfur System

Yamaguchi

Shiga

Kaburaki

2005

Science

319

127

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The sulfur-induced embrittlement of nickel has long been wrapped in mystery as to why and how sulfur weakens the grain boundaries of nickel and why a critical intergranular sulfur concentration is required. From first-principles calculations, we found that a large grain-boundary expansion is caused by a short-range overlap repulsion among densely segregated and neighboring sulfur atoms. This expansion results in a drastic grain-boundary decohesion that reduces the grain-boundary tensile strength by one order of magnitude. This decohesion may directly cause the embrittlement, because the critical sulfur concentration of this decohesion agrees well with experimental data on the embrittlement.

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“…18 This has been related to the thermodynamic driving force for segregation, and no segregation is predicted for bulk levels below about 0.1 ppm. 19,20 True interfacial measurements also verified high levels of sulfur at intact Al 2 O 3 -metal interfaces. 21,22 Accordingly, progressive improvements in cyclic-oxidation behavior have been shown for desulfurized superal- …”

Section: The Sulfur Effectmentioning

confidence: 75%

Maintaining adhesion of protective Al2O3 scales

Smialek

2000

JOM

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Maintaining good adhesion of alumina scales to the surface of heat-resistant alloys is crucial for long-term cyclic oxidation resistance. Traditionally, this is accomplished by doping the alloy with about 0.1% reactive elements. More recently, excellent adhesion has been produced without reactive elements by reducing the sulfur impurity level to less than 1 ppm. Research opportunities exist in the fundamentals of sulfur segregation, thermodynamics, and interfacial bonding. James Smialek is a senior research scientist at NASA Glenn Research Center. For more information, contact J. Smialek, NASA at Lewis Field, 106-1, 21000 Brookpark Road, Cleveland, Ohio 44135; (216) 433-5500; fax (216) 433-5544; e-mail James.L.Smialek@GRC. NASA.GOV.

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Sulfur segregation on nickel

Cited by 40 publications

References 7 publications

Compositions at Al2O3/FeCrAl interfaces after high temperature oxidation

Compositions at Al2O3/FeCrAl interfaces after high temperature oxidation

Grain Boundary Decohesion by Impurity Segregation in a Nickel-Sulfur System

Maintaining adhesion of protective Al2O3 scales

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