Effect of solute misfit and temperature on irradiation-induced segregation in binary Ni alloys

Rehn, L. E.; Okamoto, P.R.; Potter, D.I.; Wiedersich, H.

doi:10.1016/0022-3115(78)90363-x

Cited by 100 publications

(20 citation statements)

References 8 publications

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“…Any vacancies generated at the oxide/matrix interface during oxidation would artificially enhance the vacancy concentration over equilibrium concentrations and provide the means for enhanced diffusion of oversized atoms such as Cr and O within the Ni over short distances. Many reports of radiation-enhanced diffusion have shown that the migration of point defects generated by neutrons in dilute binary metal alloys and more complex alloys such as steels can cause preferential accumulation or depletion of solute and alloying elements at grain boundaries and free surfaces that act as point defect sinks [19,20]. Vacancies induced by oxidation would play a similar role.…”

Section: Discussionmentioning

confidence: 95%

TEM investigations of intergranular stress corrosion cracking in austenitic alloys in PWR environmental conditions

Lozano-Pérez

Titchmarsh

2003

Materials at High Temperatures

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Analytical transmission microscopy has been used to investigate the initiation of stress corrosion cracking in Inconel 600 subjected to constant load testing under simulated pressured water reactor primary water conditions. The observations revealed that intergranular attack proceeded by the development of a zone of polycrystalline chromia along the boundary plane intersecting either the free surface or a blunted, open crack in contact with the free surface. Ni-rich metal particles were interspersed within the chromia. Conversely, open cracks were filled with nanocrystalline NiO and large compound particles of spinel and NiO, indicating a difference in potential between closed, attacked boundaries and open cracks. Open cracks appeared to have initiated by fracture of the chromia zones, such fracture being strongly dependent on boundary geometry with respect to loading direction. The observations suggest that stress corrosion crack initiation and propagation is dependent on diffusion of oxygen through the porous oxides. Dislocations and stress could enhance diffusion as chromia was observed along slip planes at the arrested tips of blunt cracks.

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Section: Discussionmentioning

confidence: 95%

TEM investigations of intergranular stress corrosion cracking in austenitic alloys in PWR environmental conditions

Lozano-Pérez

Titchmarsh

2003

Materials at High Temperatures

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“…2.2. The idea that RIS and RIP were due to a preferential interstitial population of undersized Si atoms was reinforced by the results of experiments by Rehn et al [14] on binary Ni alloys containing 1 at. % Si, Al, Ti or Mo, the latter three of which are oversized.…”

Section: Manifestations Of Radiation-induced Solute Redistributionmentioning

confidence: 97%

Radiation-induced solute segregation in metallic alloys

Ardell

Bellon

2016

Current Opinion in Solid State and Materials Science

113

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The subject of radiation-induced solute segregation (RIS) in metallic alloys is reviewed. RIS manifests itself in several different ways, including diffusion to point-defect sinks (dislocations, grain boundaries, voids, etc.), which can induce precipitation in undersaturated alloys, as well as self-organization of solute clusters and precipitation in defect-free material.Diffusion in dilute and concentrated alloys is highlighted, as are theories of RIS that include new ideas on diffusion of complexes involving coupling between fluxes of point defects and of solute atoms. Many important experimental observations are presented, including up-to-date findings using atom-probe tomography, with special emphasis on solute segregation in austenitic and ferritic steels. Results from computational modeling and theory are also presented and discussed in light of experimental findings. Examples illustrating the factors affecting RIS are shown and some important outstanding issues that impact the current understanding of RIS are described and discussed.

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“…Irradiation of solid solution binary alloys of 1 at% AI, Ti, Mo and Si in Ni with 3.5 MeV Ni + ions produced sharp concentration gradients near the irradiated surface in all the alloys [51]. The three oversize solutes, AI, Ti and Mo with misfits of +0.05, +0.10, +0.12 (where misfit is defined as the fractional change in lattice parameter of a solid-solution alloy produced per atom fraction of solute, {Aa/a}/c), all exhibited depletion from the irradiated surface and an enriched region at intermediate depths, Fig.…”

Section: (B~ Defect-solute Comolexesmentioning

confidence: 97%

“…The first experimental observation of radiation-induced segregation was made in 1974 by Okamoto and Wiedersich [48]. Since that time, a complete theory for the mechanism of RIS has been developed [49][50][51][52][53][54][55][56][57][58] and considerable experimental evidence exists [59][60][61][62][63][64][65][66][67][68][69][70] to support the theory. RIS can be classified as non-equilibrium segregation which is driven by kinetic processes rather than by thermodynamic forces as in equilibrium segregation.…”

Section: E Radiation-induced Segregationmentioning

confidence: 99%

“…The size difference between solute and solvent atoms plays a strong role in the magnitude and direction of radiation-induced segregation through the reduction of the strain energy stored in the lattice [51]. This provides the driving force for the undersize solute substitutional atoms to preferentially exchange with solvent atoms in interstitial positions, whereas oversize solute atoms will tend to remain on, or return to, substitutional sites.…”

Section: (B~ Defect-solute Comolexesmentioning

confidence: 99%

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