The role of confinement on stress-driven grain boundary motion in nanocrystalline aluminum thin films
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چکیده
منابع مشابه
The Role of Confinement on Stress-Driven Grain Boundary Motion in Nanocrystalline Aluminum Thin Films
3D molecular dynamics simulations are performed to investigate the role of microstructural confinement on room temperature stress-driven grain boundary (GB) motion for a general population of GBs in nanocrystalline Al thin films. Detailed analysis and comparison with experimental results reveal how coupled GB migration and GB sliding are manifested in realistic nanoscale networks of GBs. The pr...
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Free-standing nanocrystalline Al thin films have been strained in situ in a transmission electron microscope at room-temperature. Extensive grain-boundary migration accompanies the in situ loading and has been observed to occur preferentially at crack tips and only in the presence of the applied stress. This grain growth precedes dislocation activity, and measured boundary velocities are greate...
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In their as-fabricated state, nanocrystalline (nc) materials, consisting of individual grains or crystallites with diameters less than 100 nm, are systems that exist far from equilibrium. The large volume fraction of grain boundaries (GB) present in these materials contains considerable excess free energy, which provides a large driving force for grain growth. Grain growth in nc materials has b...
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Room-temperature tensile experiments on sub-micrometer freestanding thin films deposited at varied base pressures reveal two distinct classes of mechanical response. Samples that contain sufficient impurity concentrations to stabilize the microstructure against an applied stress show strong but brittle response. However, films that were deposited at lower vacuum base pressures that still allow ...
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ژورنال
عنوان ژورنال: Journal of Applied Physics
سال: 2012
ISSN: 0021-8979,1089-7550
DOI: 10.1063/1.4770357