Solid state reaction of Fe/Ti nanometer-scale multilayers

Chen, T.; Wu, Zuoqiang; Cao, Baosheng; Gao, Jinliang; Lei, M.K.

doi:10.1016/j.surfcoat.2006.07.150

Cited by 9 publications

(5 citation statements)

References 11 publications

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“…Considering that the local matrix is Fe 2 Ti, it is speculated that these nanoprecipitates are FeTi intermetallics, the other stable intermetallic in the Fe-Ti system. This would be consistent with studies found in literature for thermal annealing (70) and irradiations (74; 72) of Fe-Ti multilayers.…”

Section: Irradiation and Exposure At 500˚csupporting

confidence: 93%

Study of Interfacial Interactions Using Thing Film Surface Modification: Radiation and Oxidation Effects in Materials

Sridharan¹,

Zhang²

2014

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In collaboration with: Technical AbstractInterfaces play a key role in dictating the long-term stability of materials under the influence of radiation and high temperatures. For example, grain boundaries affect corrosion by way of providing kinetically favorable paths for elemental diffusion, but they can also act as sinks for both defects and helium generated during irradiation. Likewise, the retention of high temperature strength in nanostructured, oxide dispersion strengthened steels depends strongly on the stoichiometric and physical stability of the (Y, Ti)-oxide particle/matrix interface under radiation and high temperatures. An understanding of these interfacial effects at a fundamental level is important for the development of materials for use in the extreme environments of nuclear reactors.The goal of this project is to evaluate the stability of interfaces by depositing thin films of materials on substrates, followed by ion irradiation of the film-substrate system at elevated temperatures and by post-irradiation oxidation treatments. Specifically, the research will be performed by depositing thin films of yttrium and titanium (~500nm) on a Fe-12%Cr binary alloy substrate. Y and Ti have been selected as thin film materials because they form highly stable protective oxides layers. The Fe-12%Cr binary alloy has been selected because it is representative of ferritic steels that are widely used in nuclear systems. The absence of other alloying elements in this binary alloy will allow for a clearer examination of structures and compositions that evolve during high temperature irradiations and oxidation treatments. The research is divided into four specific tasks: (1) sputter deposition of 500nm thick films of Y and Ti on Fe-12%Cr alloy substrates, (2) ion irradiation of the film-substrate system with 2MeV protons to a dose of 2dpa at temperatures of 300 o C, 500 o C, and 700 o C, (3) oxidation of asdeposited and ion irradiated samples in controlled oxygen environment at 500 o C and 700 o C, and (4) multi-scale computational modeling involving first-principle molecular dynamics (FPMD) and coarse grained dissipative particle dynamics (DPD) approaches to develop theories underlying the evolution and stability of structures and phases.Samples from Tasks 1 to 3 (above) will be rigorously characterized and analyzed using scanning electron microscopy, Auger electron microscopy, x-ray diffraction, Rutherford back scatter spectroscopy, and transmission electron microscopy. Expected outcomes of the experimental work include a quantitative understanding of film-substrate interface mixing, evolution of defects and other phases at the interface, interaction of interfaces with defects, and the ability of the Y and Ti films to mitigate irradiation-assisted oxidation.The aforementioned experimental work will be closely coupled with multi-scale molecular dynamics (MD) modeling to understand the reactions at the surface, the transport of oxidant through the thin film, and the stabilities of the deposited thin films under radi...

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Section: Irradiation and Exposure At 500˚csupporting

confidence: 93%

Study of Interfacial Interactions Using Thing Film Surface Modification: Radiation and Oxidation Effects in Materials

Sridharan¹,

Zhang²

2014

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“…Previous studies on irradiation stability of Fe/Ti multilayers, performed at room temperature, have observed the formation of a solid solution and amorphous compounds [32][33][34]. Intermixing studies performed at temperature ranges comparable to our study have observed the formation first of a Fe-Ti solid solution, followed by the precipitation of FeTi intermetallics [35][36][37]. The difference with our observations (formation of Fe 2 Ti layer along with, possibly, nanometer sized FeTi precipitates) is speculated to be due the difference in the relative Fe/Ti compositions between the cited studies (Fe/Ti ~1) and our experiment (Fe>>Ti).…”

Section: Titanium Thin Film On Fe-12%cr Substratesupporting

confidence: 75%

Irradiation-induced intermixing effects at the interfaces of titanium and titanium-dioxide thin films and Fe-12%Cr substrate

Mairov

Sridharan

2016

Nuclear Instruments and Methods in Physics Research Section B:

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Irradiation-induced compositional and structural changes at the interfaces between Fe-12%Cr binary alloy substrate and thin films of titanium and titanium-dioxide have been investigated. Irradiations were performed with 5 MeV Ni 2+ ions at 300˚C and 500˚C, up to damage levels of 40 dpa (displacements per atom). For the 300˚C irradiation case, irradiation enhanced the interdiffusion coefficient by a factor over twenty for the titanium film samples, but by a factor of only 1.2 for the titanium dioxide film samples. At 500˚C, significant intermixing was observed in the titanium film samples and resulted in the formation of a wide Fe 2 Ti reaction zone. For the titanium dioxide film samples, chromium was observed to diffuse into sub-stoichiometric regions of the film. Irradiation caused the formation of chromium-rich nanoprecipitates within the oxide film and promoted a phase transformation in the film from anatase TiO 2 to the Ti 2 O 3 phase.

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“…The good fit between experimental and simulated curves in the present study indicates very small mixing of densities at interfaces evidencing that the diffusion between interfaces in each multilayer system is very little. The minimal intermixing in both MLs can be attributed to the small activation energy of Ti compared with other nonmagnetic elements such as Al and Si [12]. The CEMS spectra of 12 and 24TLs are shown in Figure (5).…”

Section: Resultsmentioning

confidence: 99%

Thickness Dependent Structure and Magnetic Properties in <sup>57</sup>Fe/Ti/Co Multilayers

Jain

Jani

Lakshmi

et al. 2013

JNanoR

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Structural and magnetic properties of57Fe/Ti/Co multilayers (MLs), prepared by Ion beam sputtering on Si substrate have been studied as a function of trilayers (TLs) thickness and modulation periods. X-ray reflectivity (XRR) shows the successful growth of high-quality layered structures along with up to 3rdorder Bragg peaks with distinct Kiessig oscillation. X-ray diffraction (XRD) and Mössbauer studies evidence the formation of different phases mainly at the interfaces. Soft magnetic properties with high saturation values (~800emu/cm3) and high anisotropy field (~20kOe) are observed in the room temperature magnetization curve. The in plane value of coercivities are 18Oe and 60Oe for the 12 and 24 TLs respectively while in the out-of plane direction it increases to nearly 8 and 12 times respectively. The 12 TLs sample shows the presence of two fold anisotropy whereas the 24 TLs sample shows an isotropic behaviour. Low temperature DC magnetization studies evidence the presence of weak antiferromagnetic coupling while the Kelly Henkel plots for these samples show that the dominant exchange interactions between the grains are ferromagnetic.

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Solid state reaction of Fe/Ti nanometer-scale multilayers

Cited by 9 publications

References 11 publications

Study of Interfacial Interactions Using Thing Film Surface Modification: Radiation and Oxidation Effects in Materials

Study of Interfacial Interactions Using Thing Film Surface Modification: Radiation and Oxidation Effects in Materials

Irradiation-induced intermixing effects at the interfaces of titanium and titanium-dioxide thin films and Fe-12%Cr substrate

Thickness Dependent Structure and Magnetic Properties in <sup>57</sup>Fe/Ti/Co Multilayers

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