Microstructural stability of nanostructured Cu alloys during high-temperature irradiation

Vo, Nhon Q.; Chee, See Wee; Schwen, Daniel; Zhang, Xuan; Bellon, Pascal; Averback, Robert S

doi:10.1016/j.scriptamat.2010.07.009

Cited by 65 publications

(37 citation statements)

References 17 publications

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“…[24,[26][27][28]43] Excellent grain size stability, through kinetic stabilization, has been reported in literature mostly for Cu alloys containing elements which form an immiscible system with Cu. An exemplary case of this has been demonstrated in Cu-W thin films [44,45] and Cu-Ta system. [46] In conclusion, one can say that alloying elements like Zr, Y, W, Nb, Ta, etc., can be used to substantially decrease the grain growth susceptibility at high temperatures, thus enhancing the high temperature processibility as well as enabling higher temperature applications of such alloys.…”

Section: A Thermal Stabilitymentioning

confidence: 96%

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Mahesh

Raman

2014

Metall Mater Trans A

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The extremely fine grain size of nanocrystalline (nc) metallic alloys results in significantly different mechanical, electrochemical and oxidation properties as compared to the coarse-grained alloys of the same composition. Although the synthesis and attractive mechanical properties of nanocrystalline materials have been investigated and reviewed in great depth, the high temperature oxidation and electrochemical corrosion of these materials has received limited attention. The difference in the active dissolution and passivation behavior of nc alloys as compared to their microcrystalline counterparts varies for each alloy system. However, a unified theory explaining these phenomena still eludes us. In this context, this article reviews the progress in the electrochemical corrosion behavior of different nanocrystalline alloys, and hence, develops a better understanding of the effect of grain size, composition, interfacial phenomena and selective dissolution on corrosion of nanocrystalline alloys. This review also presents the role of nanometric grain size and the associated increase in grain boundary diffusion on the high temperature oxidation of nc alloys. The attractive possibility of enhanced oxidation resistance at lower alloying additions as compared to the coarse-grained alloys has been discussed. Although the primary focus of the article is on ferrous alloy systems, however, the lead studies on the role of ultrafine grain size in oxidation/corrosion behavior of other alloys systems have also been reviewed.

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Section: A Thermal Stabilitymentioning

confidence: 96%

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Mahesh

Raman

2014

Metall Mater Trans A

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“…However, in case of highly immiscible alloy systems, another case of nanostructuring has been recently identified which is almost independent of temperature and where nanoprecipitation takes place within the displacement cascades [11]. Based on the experimental results and molecular simulations, Vo et al proposed that the migration of solute atoms in the liquid phase of the thermal spike results in the precipitation of the nanoscale particles whose maximum size is comparable to size of the melt zones ~ 5 nm in Cu-Mo or in Cu-W.…”

Section: Driven Alloysmentioning

confidence: 99%

“…In this instance, it is impossible to force such alloying elements into solution, in contrast to the moderately immiscible alloy systems such as Cu-Co, Cu-Ag, or Cu-Fe. Recent results reported by Vo et al [11] indicates that in Cu-base binary Cu-X alloy systems, with X= Nb, Mo, or W, irradiation does in fact induce a nanoscale decomposition. Molecular dynamics simulations suggest that this decomposition takes place during the thermal spike phase of the displacement cascades [11].…”

Section: Introductionmentioning

confidence: 97%

“…Recent results reported by Vo et al [11] indicates that in Cu-base binary Cu-X alloy systems, with X= Nb, Mo, or W, irradiation does in fact induce a nanoscale decomposition. Molecular dynamics simulations suggest that this decomposition takes place during the thermal spike phase of the displacement cascades [11]. The scale of this decomposition is thus limited by the cascade size, typically 1 to 10 nm.…”

Section: Introductionmentioning

confidence: 97%

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Nanostructuring of Cu–TiB2 induced by ion irradiation

Lokesh

Bellon

Averback

2012

Journal of Nuclear Materials

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The stability of materials under irradiation is a critical topic and has been an area of fundamental interest in particular for materials used in nuclear reactors. These dissipative systems which exist far from equilibrium pose a challenge in understanding due to the existence of multiple dynamical processes, which are often competing. Recent modeling and experimental results of Cu-base alloys indicate that these dynamical processes can lead to nanostructuring in binary alloy system. Nanostructuring at steady state under irradiation could result in materials with very high irradiation resistance as interfaces can trap point defects and He atoms. The objective of this work was to study whether nanostructuring could also take place in multicomponent systems, possible involving the precipitation of compounds. The Cu-TiB 2 alloy system was selected and microstructural evolutions induced by 1.8 MeV Kr ion irradiation with varying fluence and wide range of temperatures were investigated. An additional objective was to identify the mode of formation of these nanostructures. Homogeneous co-sputtered Cu-TiB 2 films as well as Cu/TiB 2 multilayers were grown by physical vapor deposition as starting materials.Transmission electron microscopy revealed that irradiation of initially homogeneous films led to the nanoscale precipitation of second phase TiB 2 particles, with an average diameter of 5 nm. This nanostructuring reached similar steady states for irradiation temperatures ranging from room temperature to 650 °C. It is thus concluded that this nanoprecipitation takes place in displacement cascades.

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“…An alternative route to the synthesis of radiation-resistant nanostructures is offered by taking advantage of irradiation-induced self-organization reactions at the nanoscale. Examples of these self-organization reactions triggered by irradiation are (i) the stabilization of ordered gamma prime precipitates a few nanometers in diameter in a gamma matrix in Ni-Al alloys [37]; (ii) the formation of void and bubbles lattices in many metals and alloys (see [38] for a review); and (iii) the patterning of nanoscale phases in immiscible alloy systems [39][40][41][42][43], for instance in Cu-Ag, Cu-Fe, Cu-Co, Cu-Nb, Cu-Mo, and Cu-W.…”

Section: Stable Microstructuresmentioning

confidence: 99%

Atomic-scale design of radiation-tolerant nanocomposites

2010

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Recent work indicates that materials with nanoscale architectures, such as nanolayered Cu-Nb composites and nanoscale oxide dispersion-strengthened steels, are both thermally stable and offer improved performance under irradiation.Current understanding of the atomic-level response of such materials to radiation yields insights into how controlling composition, morphology and interface-defect interactions may further enable atomic-scale design of radiation tolerant nanostructured composite materials. With greater understanding of irradiationassisted degradation mechanisms, this bottom-up design approach may pave the way for creating the extreme environment-tolerant structural materials needed to meet the world's clean energy demand by expanding use of advanced fission and future fusion power.2

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Microstructural stability of nanostructured Cu alloys during high-temperature irradiation

Cited by 65 publications

References 17 publications

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Nanostructuring of Cu–TiB2 induced by ion irradiation

Atomic-scale design of radiation-tolerant nanocomposites

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