Point defect annihilation at grain boundaries in gold

Dollár, M.; Gleiter, H.

doi:10.1016/0036-9748(85)90118-8

Cited by 34 publications

(18 citation statements)

References 11 publications

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“…In both GBs, this switch is preceded by a gradual reduction in Dv GB and is coincident with a rapid rise in Dv GB as shown in Fig. 2d and f. Similar variations ins 1 GB may be seen, as displayed in Fig. 2g and i.…”

Section: Correlations Among Area-average Gb Propertiessupporting

confidence: 68%

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Non-coherent Cu grain boundaries driven by continuous vacancy loading

Demkowicz

2015

J Mater Sci

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We use atomistic modeling to study the response of three non-coherent grain boundaries (GBs) in Cu to continuous loading with vacancies. Our simulations yield insights into the structure and properties of these boundaries both near and far from thermal equilibrium. We find that GB energies vary periodically as a function of the number of vacancies introduced. Each GB has a characteristic minimum energy state that recurs during continuous vacancy loading, but in general cannot be reached without removing atoms from the boundary. There is no clear correlation of GB energies with GB specific excess volumes or stresses during vacancy loading. However, GB stresses increase monotonically with specific excess volumes. Continuous vacancy loading gives rise to GB migration and shearing, despite the absence of applied loads. Successive vacancies introduced into some of the boundaries accumulate at the cores of what appear to be generalized vacancy dislocation loops. We discuss the implications of these findings for our understanding of grain boundary sink efficiencies under light ion irradiation.

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Section: Correlations Among Area-average Gb Propertiessupporting

confidence: 68%

“…Grain boundaries (GBs) are sinks for point defects, such as vacancies and interstitials [1][2][3][4][5]. This property of GBs may be used to improve the radiation resistance of polycrystalline solids [6][7][8].…”

Section: Motivationmentioning

confidence: 99%

Non-coherent Cu grain boundaries driven by continuous vacancy loading

Demkowicz

2015

J Mater Sci

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“…Experiments have shown that certain coincidence grain boundaries (e.g., Σ3 and Σ9) have sink strengths (pertaining to radiation-induced segregation) that deviate from that in general high angle grain boundaries 14 . Moreover, other experiments have shown differences between grain boundaries in their ability to annihilate point defects 15 . These results present an interesting opportunity for designing radiation-tolerant materials, i.e., the grain boundary character of polycrystalline materials can be engineered to enhance their beneficial effects while reducing their detrimental effects, as was first proposed by Watanabe 16 .…”

Section: Introductionmentioning

confidence: 99%

Probing grain boundary sink strength at the nanoscale: Energetics and length scales of vacancy and interstitial absorption by grain boundaries inα-Fe

et al. 2012

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The energetics and length scales associated with the interaction between point defects (vacancies and self-interstitial atoms) and grain boundaries in BCC Fe was explored. Molecular statics simulations were used to generate a grain boundary structure database that contained ≈ 170 grain boundaries with varying tilt and twist character. Then, vacancy and self-interstitial atom formation energies were calculated at all potential grain boundary sites within 15Å of the boundary. The present results provide detailed information about the interaction energies of vacancies and selfinterstitial atoms with symmetric tilt grain boundaries in iron and the length scales involved with absorption of these point defects by grain boundaries. Both low and high angle grain boundaries were effective sinks for point defects, with a few low-Σ grain boundaries (e.g., the Σ3{112} twin boundary) that have properties different from the rest. The formation energies depend on both the local atomic structure and the distance from the boundary center. Additionally, the effect of grain boundary energy, disorientation angle, and Σ-designation on the boundary sink strength was explored; the strongest correlation occurred between the grain boundary energy and the mean point defect formation energies. Based on point defect binding energies, interstitials have ≈ 80% more grain boundary sites per area and ≈ 300% greater site strength than vacancies. Last, the absorption length scale of point defects by grain boundaries is over a full lattice unit larger for interstitials than for vacancies (mean of 6-7Å vs. 10-11Å for vacancies and interstitials, respectively).

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“…Interfaces with differing atomic structures, however, may exhibit disparate sink strengths [19,20], diffusivities [21], mechanical properties [22], and susceptibilities to embrittlement [23]. Interfaces, however, also increase the free energy of a material and in some cases may be its weakest microstructural link, limiting its overall lifetime [24].…”

Section: Tailored Interfacesmentioning

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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Point defect annihilation at grain boundaries in gold

Cited by 34 publications

References 11 publications

Non-coherent Cu grain boundaries driven by continuous vacancy loading

Non-coherent Cu grain boundaries driven by continuous vacancy loading

Probing grain boundary sink strength at the nanoscale: Energetics and length scales of vacancy and interstitial absorption by grain boundaries inα-Fe

Atomic-scale design of radiation-tolerant nanocomposites

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