@article{68de11891663432dae833ee8cf9b8124,
title = "Radiation-induced precipitation at the alloy surface during ion bombardment",
abstract = "A kinetic approach to model radiation-induced formation of a precipitate layer on the surface of a binary alloy during ion bombardment is described. Sample calculations were performed for the case of Ni3Si coating on a NiSi alloy surface. The strong coupling between Si atoms and radiation-generated defect fluxes causes a significant Si enrichment at the surface, which gives rise to the formation of a precipitate layer when it exceeds the Si solubility limit. The stability of this layer depends on the competition between the rates of precipitation and sputtering. Both the receding surface and the moving precipitate/matrix interface were accounted for by means of a mathematical scheme of boundary immobilization. The dependences of the precipitation kinetics and the development of solute concentration profiles in the alloy matrix on bombardment temperature, ion flux and alloy composition were examined.",
author = "Yacout, {A. M.} and Lam, {N. Q.} and Stubbins, {James F}",
note = "Radiation-induced segregation of alloying elements toward extended defect sinks such as dislocations, voids, grain boundaries and external surfaces is commonly observed in alloys during irradiation at elevated temperatures [1,2] . In the particular case of Ni-Si alloys, it is well established that preferential coupling between Si-atoms and radiation-generated interstitial fluxes gives rise to significant enrichment of Si at defect sinks. Whenever the local Si enrichment surpasses the solubility limit, precipitation of the ordered N' 3S' (y') phase occurs. As additional Si segregates from the bulk toward the sink, this new phase grows. N',S' coatings on dislocation loops and external surfaces have been observed [3,4]. The growth of these coatings on the surface of Ni-12 .7 at .% Si alloys during I-McV proton irradiation at various temperatures was measured by Rehn et al . [5] . The kinetics of precipitate growth under uniform irradiation conditions was theoretically modeled by Lam et al. [6] . A comparison of model calculations with the experimental measurements has * Work supported by the US Department of Energy, BES-Materials Sciences, under Contract W-31-109-Eng-38, and the National Science Foundation, under Contract ECS-85157722. Correspondence to. Dr. N .Q. Lam, Argonne National Laboratory, MSD-212, Argonne IL 60439, USA .",
year = "1992",
month = aug,
day = "2",
doi = "10.1016/0168-583X(92)95315-I",
language = "English (US)",
volume = "71",
pages = "148--154",
journal = "Nuclear Inst. and Methods in Physics Research, B",
issn = "0168-583X",
publisher = "Elsevier B.V.",
number = "2",
}