Does sink efficiency unequivocally characterize how grain boundaries impact radiation damage ?

2018-11-21
El-Atwani, O.
Martinez, E.
Esquivel, E.
Efe, Mert
Taylor, C.
Wang, Y. Q.
Uberuaga, B. P.
Matoy, S. A.
Show full item record
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
133
views
0
downloads
The role of grain boundaries in limiting irradiation damage in nanocrystalline materials is often correlated with the grain boundary sink efficiency. Here, we demonstrate on a tungsten material system (which has very distinct vacancy and interstitial mobilities) that sink efficiency does not unequivocally describe how grain boundaries impact irradiation damage. Rather, it reflects a particular defect diffusion equation that can change if any of the bulk conditions change. Even when denuded zone formation does not occur and grain boundaries have zero sink efficiencies, grain boundaries still impact the performance of nanocrystalline materials under irradiation by acting as a saturable defect storage site. However, denuded zone formation can occur under a necessary requirement of extra defect recombination at the grain boundaries (which, for example, is not possible when vacancy migration does not occur). These insights provide answers to several outstanding questions regarding the sink efficiency of a grain boundary and assist in parametrizing the role of grain boundaries in limiting irradiation damage in nanocrystalline materials.
Irradiation-induced defects, Heavy-ion irradiation, In-situ, Nanocrystalline Tungsten, Mechanical-properties, Vacancy diffusion, Bubble formation, Microstructure, Ultrafine, Helium
https://hdl.handle.net/11511/57018
PHYSICAL REVIEW MATERIALS
Department of Metallurgical and Materials Engineering, Article

Suggestions

Effect of geosynthetic reinforcement on the bearing capacity of strip footing on sandy soil
Al-Subari, L.; Hanafi, M.; Ekinci, A. (2020-08-01)
Due to the increasing presence of problematic soils, expansive clays and highly compressive sand engineers are using a verity of soil improvement techniques to treat such soils. While geosynthetics are extensively used for improving soil characteristics in roads, pavements and embankments, it can also be used to increase the lack of bearing capacity of residential housing or lightweight structures constructed on sandy soils. In order to simulate site conditions in the laboratory environment, a laboratory-sc...
A Study of settlement of stone columns by finite element modeling through case histories
Yardım, Cemre Harzem; Ergun, Mehmet Ufuk; Department of Civil Engineering (2013)
Stone column technique is mostly used to reinforce soft cohesive soils. Settlements are decreased under foundations and bearing capacity is increased. This study initially focuses on a comprehensive review of literature about stone column reinforced soils. Afterwards, numerical modeling of stone column reinforced soft clays is done. Three different cases are chosen on different foundation soils mainly soft clays. Parametric studies are done to determine influence of parameters on settlement reduction ratio ...
Consequences of dewatering cement mortars incorporated with ground Bayburt stone
Ince, Ceren; Derogar, Shahram (Thomas Telford Ltd., 2018-06-01)
The detrimental effects of the rapid dewatering of cement mortars due to the interaction of wet mortar and brick substrate at the freshly mixed state in masonry construction are often addressed in the literature. The desorptivity and hence very high water releasing ability of cement mortars result in a great water loss during dewatering that significantly affects the fresh and hardened state properties of the end product. The paper therefore investigates the possible role of ground Bayburt stone incorporati...
The Role of Electrostatic Interaction between Free Charge Carriers and Counterions in Thermoelectric Power Factor of Conducting Polymers: From Crystalline to Polycrystalline Domains
Shi, Wen; Yıldırım, Erol; Wu, Gang; Wong, Zicong Marvin; Deng, Tianqi; Wang, Jian-Sheng; Xu, Jianwei; Yang, Shuo-Wang (2020-06-01)
One of the most burning problems in organic thermoelectrics is the lack of deep understanding on the key limiting factors of thermoelectric efficiency at different length scales for conducting polymers. Here, by examining a prototypical pi-conjugated polymer, poly(3-hexylthiophene) from molecular level to crystalline and polycrystalline domains, and on the basis of first-principles calculations, new insights are presented into the thermoelectric transport in conducting polymers, and new material design guid...
Softening due to Grain Boundary Cavity Formation and its Competition with Hardening in Helium Implanted Nanocrystalline Tungsten
Cunningham, W. Streit; Gentile, Jonathan M.; El-Atwani, Osman; Taylor, Chase N.; Maloy, Stuart A.; Trelewicz, Jason R.; Efe, Mert (Springer Science and Business Media LLC, 2018-2-13)
The unique ability of grain boundaries to act as effective sinks for radiation damage plays a significant role in nanocrystalline materials due to their large interfacial area per unit volume. Leveraging this mechanism in the design of tungsten as a plasma-facing material provides a potential pathway for enhancing its radiation tolerance under fusion-relevant conditions. In this study, we explore the impact of defect microstructures on the mechanical behavior of helium ion implanted nanocrystalline tungsten...
Citation Formats
O. El-Atwani et al., “Does sink efficiency unequivocally characterize how grain boundaries impact radiation damage ?,” PHYSICAL REVIEW MATERIALS, pp. 0–0, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/57018.
METU IIS - Integrated Information Service open@metu.edu.tr