Dimples on Nanocrystalline Fracture Surfaces As Evidence for Shear Plane Formation
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- A. Hasnaoui
- Paul Scherrer Institute, CH-5232, Villigen-PSI, Switzerland
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- H. Van Swygenhoven
- Paul Scherrer Institute, CH-5232, Villigen-PSI, Switzerland
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- P. M. Derlet
- Paul Scherrer Institute, CH-5232, Villigen-PSI, Switzerland
書誌事項
- 公開日
- 2003-06-06
- DOI
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- 10.1126/science.1084284
- 公開者
- American Association for the Advancement of Science (AAAS)
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説明
<jats:p>Tensile experiments of fully dense nanocrystalline structures with a mean grain size of less than 100 nanometers demonstrate a considerable increase in hardness but a remarkable drop in elongation-to-failure, indicating brittle behavior. However, dimple structures are often observed at the fracture surface, indicating some type of ductile fracture mechanism. Guided by large-scale atomistic simulations, we propose that these dimple structures result from local shear planes formed around clustered grains that, because of their particular misorientation, cannot participate in the grain boundary accommodation processes necessary to sustain plastic deformation. This raises the expectation that general high-angle grain boundaries are necessary for good ductility.</jats:p>
収録刊行物
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- Science
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Science 300 (5625), 1550-1552, 2003-06-06
American Association for the Advancement of Science (AAAS)