Amorphization of oxides in ODS materials under low and high energy ion irradiations

Lescoat, M.-L.; Monnet, I.; Ribis, J.; Dubuisson, Philippe; Carlan, Y. de; Costantini, Jean‐Marc; Malaplate, J.

doi:10.1016/j.jnucmat.2011.01.065

Cited by 29 publications

(11 citation statements)

References 8 publications

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“…The preferential amorphization of the oxides dispersed in ODS steel was often triggered by ion radiation because the oxides acted as effective sinks for trapping point defects404142. Therefore, it is reasonable to believe that the asymmetric interaction of point defects and heterophase interfaces has a significant impact on the microstructure evolution of the radiation tolerant materials.…”

Section: Discussionmentioning

confidence: 99%

Asymmetric interaction of point defects and heterophase interfaces in ZrN/TaN multilayered nanofilms

Lao

Shi

et al. 2017

Sci Rep

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Materials with a high density of heterophase interfaces, which are capable of absorbing and annihilating radiation-induced point defects, can exhibit a superior radiation tolerance. In this paper, we investigated the interaction behaviors of point defects and heterophase interfaces by implanting helium atoms into the ZrN/TaN multilayered nanofilms. It was found that the point defect-interface interaction on the two sides of the ZrN/TaN interface was asymmetric, likely due to the difference in the vacancy formation energies of ZrN and TaN. The helium bubbles could migrate from the ZrN layers into the TaN layers through the heterophase interfaces, resulting in a better crystallinity of the ZrN layers and a complete amorphization of the TaN layers. The findings provided some clues to the fundamental behaviors of point defects near the heterophase interfaces, which make us re-examine the design rules of advanced radiation-tolerant materials.

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Section: Discussionmentioning

confidence: 99%

Asymmetric interaction of point defects and heterophase interfaces in ZrN/TaN multilayered nanofilms

Lao

Shi

et al. 2017

Sci Rep

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“…the nature of the oxide, the irradiation dose, and the irradiation temperature [43], [47]. Of these factors, temperature is most well-understood, and a critical amorphization temperature can be determined for any given ODS system and irradiation conditions [43].…”

Section: Crystal Structurementioning

confidence: 99%

A review of the irradiation evolution of dispersed oxide nanoparticles in the b.c.c. Fe-Cr system: Current understanding and future directions

Wharry

Swenson

Yano

2017

Journal of Nuclear Materials

102

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Thus far, a number of studies have investigated the irradiation evolution of oxide nanoparticles in b.c.c. Fe-Cr based oxide dispersion strengthened (ODS) alloys. But given the inconsistent experimental conditions, results have been widely variable and inconclusive. Crystal structure and chemistry changes differ from experiment to experiment, and the total nanoparticle volume fraction has been observed to both increase and decrease. Furthermore, there has not yet been a comprehensive review of the archival literature. In this paper, we summarize the existing studies on nanoparticle irradiation evolution. We note significant observations with respect to oxide nanoparticle crystallinity, composition, size, and number density. We discuss three possible contributing mechanisms for nanoparticle evolution: ballistic dissolution, Ostwald ripening, and irradiation-enhanced diffusion. Finally, we propose future directions to achieve a more comprehensive understanding of irradiation effects on oxide nanoparticles in ODS alloys.

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“…Interior nano-sized oxides present a strong pinning effect to maintain the high density of dislocations and to restrain grain growth at high operating temperatures20. However, despite these advantages, the ODS steels themselves are not immune to irradiation: under irradiation, solute atoms redistribute at the M/O interface, which results in the degradation of the existing oxide phases212223 and/or the nucleation of deleterious phases. For example, under irradiation, recoil resolution happens in one type of ODS ferritic steels (Fe − 13Cr − 1.5Mo + 1TiO 2 + 0.5Y 2 O 3 )24 and halos of finer particles have been observed25.…”

mentioning

confidence: 99%

Cr incorporated phase transformation in Y2O3 under ion irradiation

Yadav

et al. 2017

Sci Rep

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Under irradiation, chemical species can redistribute in ways not expected from equilibrium behavior. In oxide-dispersed ferritic alloys, the phenomenon of irradiation-induced Cr redistribution at the metal/oxide interfaces has drawn recent attention. Here, the thermal and irradiation stability of the FeCr/Y2O3 interface has been systematically studied. Trilayer thin films of 90 nm Fe - 20 at.% Cr (1st layer)/100 nm Y2O3 (2nd layer)/135 nm Fe - 20 at.% Cr (3rd layer) were deposited on MgO substrates at 500 °C. After irradiation, Cr diffuses towards and enriches the FeCr/Y2O3 interface. Further, correlated with Cr redistributed into the oxide, an amorphous layer is generated at the interface. In the Y2O3 layer, the original cubic phase is observed to transform to the monoclinic phase after irradiation. Meanwhile, nanosized voids, with relatively larger size at interfaces, are also observed in the oxide layer. First-principles calculations reveal that Cr substitution of Y interstitials in Y2O3 containing excess Y interstitials is favored and the irradiation-induced monoclinic phase enhances this process. Our findings provide new insights that may aid in the development of irradiation resistant oxide-dispersed ferritic alloys.

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Amorphization of oxides in ODS materials under low and high energy ion irradiations

Cited by 29 publications

References 8 publications

Asymmetric interaction of point defects and heterophase interfaces in ZrN/TaN multilayered nanofilms

Asymmetric interaction of point defects and heterophase interfaces in ZrN/TaN multilayered nanofilms

A review of the irradiation evolution of dispersed oxide nanoparticles in the b.c.c. Fe-Cr system: Current understanding and future directions

Cr incorporated phase transformation in Y2O3 under ion irradiation

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