Radiation damage tolerant nanomaterials

Beyerlein, Irene J.; Caro, A.; Demkowicz, Michael J.; Mara, Nathan A.; Misra, Amit; Uberuaga, Blas P.

doi:10.1016/j.mattod.2013.10.019

Cited by 471 publications

(247 citation statements)

References 72 publications

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“…As molecular dynamics simulations show that grain boundaries can act as a sink for radiation-induced point defects produced from radiation damage, [170][171][172] the increased density of interfaces in nanocrystalline materials results in enhanced radiation resistance. In truth, this high surface area of interfaces has similarly motivated efforts in Cu-Nb multilayered thin films for radiation resistance.…”

Section: Radiation Resistancementioning

confidence: 99%

“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

Tschopp

Murdoch

Kecskes

et al. 2014

JOM

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It is a new beginning for innovative fundamental and applied science in nanocrystalline materials. Many of the processing and consolidation challenges that have haunted nanocrystalline materials are now more fully understood, opening the doors for bulk nanocrystalline materials and parts to be produced. While challenges remain, recent advances in experimental, computational, and theoretical capability have allowed for bulk specimens that have heretofore been pursued only on a limited basis. This article discusses the methodology for synthesis and consolidation of bulk nanocrystalline materials using mechanical alloying, the alloy development and synthesis process for stabilizing these materials at elevated temperatures, and the physical and mechanical properties of nanocrystalline materials with a focus throughout on nanocrystalline copper and a nanocrystalline Cu-Ta system, consolidated via equal channel angular extrusion, with properties rivaling that of nanocrystalline pure Ta. Moreover, modeling and simulation approaches as well as experimental results for grain growth, grain boundary processes, and deformation mechanisms in nanocrystalline copper are briefly reviewed and discussed. Integrating experiments and computational materials science for synthesizing bulk nanocrystalline materials can bring about the next generation of ultrahigh strength materials for defense and energy applications.

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Section: Radiation Resistancementioning

confidence: 99%

“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

Tschopp

Murdoch

Kecskes

et al. 2014

JOM

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“…1,2 One particular example to that end is the development of fusion as a clean, sustainable energy source, which relies extensively on tungsten for the design of plasma facing components due to its high melting point, good thermal conductivity, high temperature strength, sputtering resistance, and chemical compatibility with tritium. 3 A number of strategies focused on alloy design have been pursued for enhancing the performance of tungsten for extreme environment applications.…”

Section: Introductionmentioning

confidence: 99%

Solute stabilization of nanocrystalline tungsten against abnormal grain growth

et al. 2017

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Microstructure and phase evolution in magnetron sputtered nanocrystalline tungsten and tungsten alloy thin films are explored through in situ TEM annealing experiments at temperatures up to 1000°C. Grain growth in unalloyed nanocrystalline tungsten transpires through a discontinuous process at temperatures up to 550°C, which is coupled to an allotropic phase transformation of metastable b-tungsten with the A-15 cubic structure to stable body centered cubic (BCC) a-tungsten. Complete transformation to the BCC a-phase is accompanied by the convergence to a unimodal nanocrystalline structure at 650°C, signaling a transition to continuous grain growth. Alloy films synthesized with compositions of W-20 at.% Ti and W-15 at.% Cr exhibit only the BCC a-phase in the as-deposited state, which indicate the addition of solute stabilizes the films against the formation of metastable b-tungsten. Thermal stability of the alloy films is significantly improved over their unalloyed counterpart up to 1000°C, and grain coarsening occurs solely through a continuous growth process. The contrasting thermal stability between W-Ti and W-Cr is attributed to different grain boundary segregation states, thus demonstrating the critical role of grain boundary chemistry in the design of solute-stabilized nanocrystalline alloys. transition with a focus on harsh environment sensors produced by additive manufacturing processes. Professor Trelewicz's research is on the science of interface engineered alloys with particular emphasis on high-strength and radiation-tolerant nanomaterials for extreme environment applications. His group couples in situ and analytical characterization tools with large-scale atomistic simulations to explore the thermal stability, mechanical behavior, and radiation tolerance of solute-stabilized nanocrystalline alloys, crystalline-amorphous nanolaminates, metallic glass matrix composites, and other unique hierarchical metallic structures. Professor Trelewicz is a recipient of the 2017 DOE Early Career

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“…The second reason is related to the fact that zirconium and zircalloys (Zr-Nb for instance) are widely employed in nuclear industry due to their small capture cross-section for thermal neutrons, their relatively good high-temperature strength and resistance to corrosion [55,56]. In view of the positive role of interfaces against radiation damage (as mentioned before NMMs are largely used as model material to study the role of interfaces on radiation-induced point defects) [10][11][12][57][58][59], Zr-based NMMs could represent a promising candidate material for the future nuclear industry. Therefore, in this study comprehensive structural analyses via analytical scanning transmission electron microscopy (STEM) in combination with nano-mechanical measurements are presented with the aim of correlating very fine structural details with observed mechanical behaviour.…”

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confidence: 99%

Combined size and texture-dependent deformation and strengthening mechanisms in Zr/Nb nano-multilayers

Callisti

Polcar

2017

Acta Materialia

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A combination of transmission electron microscopy analyses and nanomechanical measurements was performed in this study to reveal deformation and strengthening mechanisms occurring in sputtered Zr/Nb nanoscale metallic multilayers (NMMs) with a periodicity (L) in the range 6 -167 nm. Electron diffraction analyses revealed a change in the crystallographic orientation of α-Zr when L ≤ 27 nm, while Nb structure retained the same orientations regardless of L. For L > 60 nm, the strengthening mechanism is well described by the Hall-Petch model, while for 27 < L < 60 nm the refined CLS model comes into picture. A decrease in strength is found for L < 27 nm, which could not be simply explained by considering only misfit and Koehler stresses. For L ≤ 27 nm, plastic strain measured across compressed NMMs revealed a change in the plastic behaviour of α-Zr, which experienced a hard-to-soft transition. At these length scales, the combination of two structural factors were found to affect the strength. These relate to the formation of weaker interfaces which extend the effective distance between strong barriers against dislocation transmission, thus producing a softening effect. 1The second effect relates to the crystallographic orientation change exhibited by α-Zr for L < 27 nm with a consequent change of the dominant slip system. The actual strength at these smaller length scales was effectively quantified by taking these structural aspects into account in the interface barrier strength model.

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Radiation damage tolerant nanomaterials

Cited by 471 publications

References 72 publications

“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

“Bulk” Nanocrystalline Metals: Review of the Current State of the Art and Future Opportunities for Copper and Copper Alloys

Solute stabilization of nanocrystalline tungsten against abnormal grain growth

Combined size and texture-dependent deformation and strengthening mechanisms in Zr/Nb nano-multilayers

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