Simulation of grain growth in nanocrystalline nickel induced by ion irradiation

Voegeli, Wolfgang; Albe, Karsten; Hahn, Horst

doi:10.1016/s0168-583x(02)01862-1

Cited by 57 publications

(31 citation statements)

References 10 publications

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“…The model suggested that the thermal spikes created during ion irradiation activate atomic jumps and result in mobility of grain boundaries. Similar experimental and modeling works have been reported by other researchers [33][34][35]. Based on the "thermal spike" model, the grain size would saturate at a certain fluence and the saturated grain size can be correlated with the size of the collision cascade generated by a single ion.…”

Section: Irradiation-induced Grain Growthsupporting

confidence: 77%

Radiation Tolerance in Nano-Structured Crystalline Fe(Cr)/Amorphous SiOC Composite

Wang

Shao

et al. 2019

Crystals

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The management of irradiation defects is one of key challenges for structural materials in current and future reactor systems. To develop radiation tolerant alloys for service in extreme irradiation environments, the Fe self-ion radiation response of nanocomposites composed of amorphous silicon oxycarbide (SiOC) and crystalline Fe(Cr) were examined at 10, 20, and 50 displacements per atom damage levels. Grain growth in width direction was observed to increase with increasing irradiation dose in both Fe(Cr) films and Fe(Cr) layers in the nanocomposite after irradiation at room temperature. However, compared to the Fe(Cr) film, the Fe(Cr) layers in the nanocomposite exhibited ~50% less grain growth at the same damage levels, suggesting that interfaces in the nanocomposite were defect sinks. Moreover, the addition of Cr to α-Fe was shown to suppress its grain growth under irradiation for both the composite and non-composite case, consistent with earlier molecular dynamic (MD) modeling studies.

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Section: Irradiation-induced Grain Growthsupporting

confidence: 77%

Radiation Tolerance in Nano-Structured Crystalline Fe(Cr)/Amorphous SiOC Composite

Wang

Shao

et al. 2019

Crystals

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“…At these temperatures the diffusion length is shorter than the recombination radius, supporting the idea that only defects created in the direct vicinity of the grain boundary participate in grain growth. Assumption 1 is also supported by computer simulations from Voegeli et al 25 who used molecular dynamics ͑MD͒ to simulate 5 keV cascades in nanocrystalline-Ni samples and found that ion-induced grain growth is observed only if the thermal spike volume is larger than the grain volume or overlaps the grain-boundary area. If the spike volume does not reach the grain-boundary area, ion-induced grain growth is not observed.…”

Section: A Driving Force For Grain-boundary Migration and Assumptionsmentioning

confidence: 82%

A thermal spike model of grain growth under irradiation

Kaoumi

Motta

Birtcher

2008

Journal of Applied Physics

213

114

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The experimental study of grain growth in nanocrystalline metallic foils under ion irradiation showed the existence of a low-temperature regime ͑below about 0.15-0.22T m ͒, where grain growth is independent of the irradiation temperature, and a thermally assisted regime where grain growth is enhanced with increasing irradiation temperature. A model is proposed to describe grain growth under irradiation in the temperature-independent regime, based on the direct impact of the thermal spikes on grain boundaries. In the model, grain-boundary migration occurs by atomic jumps, within the thermal spikes, biased by the local grain-boundary curvature driving. The jumps in the spike are calculated based on Vineyard's analysis of thermal spikes and activated processes using a spherical geometry for the spike. The model incorporates cascade structure features such as subcascade formation, and the probability of subcascades occurring at grain boundaries. This results in a power law expression relating the average grain size with the ion dose with an exponent equal to 3, in agreement with the experimental observations. The model is applied to grain growth observed in situ in a transmission electron microscope in a wide range of doses, temperature, and irradiation conditions for four different pure metals, and shown to predict well the results in all applicable cases. Some discussions are also presented on the expansion of the model to the thermally assisted regime. The paper is organized in six sections. Section I gives background and literature review, while Secs. II and III review experimental methods and results for in situ grain growth under irradiation. Section IV derives the model proposed to find the grain-growth equation in the nonthermal regime, and in Sec. V the model is applied to the results. In Sec. VI grain growth in the thermally assisted regime is discussed and Sec. VII presents the conclusions.

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“…The preferred sites for the sink of interstitials are grain boundary dislocations and triple junctions. Molecular dynamics simulations conducted in [207] also demonstrate that the grain boundary structure at the nanoscale regime strongly affects the primary radiation damage state, with the grain boundary acting as a sink for interstitials.…”

Section: Irradiation Resistance Of Bulk Nanostructured Metallic Matermentioning

confidence: 95%

Multifunctional Properties of Bulk Nanostructured Metallic Materials

Sabirov

Enikeev

Murashkin

et al. 2015

Bulk Nanostructured Materials With Multifunctional Properties

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This chapter focuses on multifunctional properties of bulk nanostructured metallic materials and structure-properties relationship therein. The most important structural factors affecting mechanical, physical, and chemical properties of the nanomaterials are discussed, and the strategies to their further improvement are outlined. Special attention is paid to nanostructural design for simultaneous improvement of mutually exclusive properties. Superstrength and Enhanced Mechanical PropertiesAlthough the mechanical and functional properties of all polycrystalline metallic materials are determined by several factors, the grain size of the material generally plays the most significant and often a dominant role. Thus, the strength of different polycrystalline materials is related to the grain size, d, through the Hall-Petch equation which states that the yield stress, σ y , is given bywhere σ o is termed the friction stress and k y the Hall-Petch constant [1,2]. It follows from Eq. 3.1 that the strength increases with a reduction in the grain size and this has led to an ever-increasing interest in fabricating materials with extremely small grain sizes. The fabrication of bulk samples and billets using equal channel angular pressing (ECAP), high pressure torsion (HPT), and other severe plastic deformation (SPD) techniques was a crucial first step in initiating investigations into the properties of bulk nanomaterials because the use of SPD processing permitted, and subsequently fully supported, a series of systematic studies using various nanostructured metallic materials including commercial alloys [3][4][5][6][7][8]

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Simulation of grain growth in nanocrystalline nickel induced by ion irradiation

Cited by 57 publications

References 10 publications

Radiation Tolerance in Nano-Structured Crystalline Fe(Cr)/Amorphous SiOC Composite

Radiation Tolerance in Nano-Structured Crystalline Fe(Cr)/Amorphous SiOC Composite

A thermal spike model of grain growth under irradiation

Multifunctional Properties of Bulk Nanostructured Metallic Materials

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