Nonequilibrium vacancy-stimulated diffusion (induced diffusion) as the main mechanism of activated alloy formation

Gapontsev, V. L.; Koloskov, Valerie M.

doi:10.1007/s11041-007-0093-7

Cited by 6 publications

(1 citation statement)

References 9 publications

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“…According to the existing concepts [2,3], the formation of such non equilibrium segregates is caused by directional flows of point defects from the bulk onto the GBs, which lead to the separation of alloy components in near bound ary regions (inverse Kirkendall effect). The directed flows of point defects are not, probably, the only rea son for the occurrence of concentration irregularities in nanocrystalline alloys (see the discussion in [4][5][6][7]). Nevertheless, it is possible to assume that under cer tain conditions [1,2] the contribution of inverse Kirk endall effect to the formation of grain boundary segre gates is dominant.…”

Section: Introductionmentioning

confidence: 99%

Formation of grain boundary segregations in alloy Fe-Cr-Ni during strong deformation and under radiation

Starikov

Кузнецов

Сагарадзе

et al. 2012

Phys. Metals Metallogr.

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Segregation of nickel in grain boundaries (GBs) in the Fe-Cr-Ni alloy induced by radiation (RIS) or plastic deformation (DIS) has been studied in the framework of a model which considers the gener ation of point defects, their mutual recombination, and absorption in GBs. It has been demonstrated that at sufficiently high rates of generation of point defects and in certain temperature ranges the achievement of a stationary state can be preceded by the stage of "rapid" segregation at which the Ni concentration in GBs reaches its maximum. Such mode of formation of segregations can be observed not only upon radiation ("rapid" RIS mode), but also under the conditions of severe deformation (cold rolling, equal channel angu lar pressing); in the latter case, the segregates are inherited after the termination of deformation.

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