The Experts below are selected from a list of 42912 Experts worldwide ranked by ideXlab platform
Fereshteh Ebrahimi - One of the best experts on this subject based on the ideXlab platform.
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transition of deformation and fracture behaviors in nanostructured face centered Cubic metals
Applied Physics Letters, 2004Co-Authors: Hongqi Li, Fereshteh EbrahimiAbstract:Tensile stress–strain curves demonstrate that single-phase nanocrystalline Face-Centered-Cubic (fcc) metals are intrinsically ductile and their failure begins with necking. However, the area reductions and the fracture behaviors were found to be dependent on the grain size. When plastic deformation is governed by dislocation activity, the nanocrystalline samples behave similar to the conventional coarse-grained materials. As the grain size is reduced to the regime where grain boundary sliding dominates, the material shows very high strain-hardening rate and the tensile samples fail by microcracking with no noticeable reduction in area.
Zhonghao Jiang - One of the best experts on this subject based on the ideXlab platform.
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strain rate sensitivity of face centered Cubic nanocrystalline materials based on dislocation deformation
Journal of Applied Physics, 2006Co-Authors: Jianshe Lian, C D Gu, Qing Jiang, Zhonghao JiangAbstract:The relationship between strain rate sensitivity and activation volume for Face-Centered-Cubic metals is proposed based on the bow-out model of single dislocation from its source, which gives reasonable prediction of the enhanced strain rate sensitivity that occurs in nanostructured and ultrafine grained Ni and Cu.
Mark A. Wall - One of the best experts on this subject based on the ideXlab platform.
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Formation of Face-Centered Cubic titanium on a Ni single crystal and in Ni/Ti multilayers
Journal of Materials Research, 1994Co-Authors: Alan F. Jankowski, Mark A. WallAbstract:The artificial layering of metals can change both physical and structural characteristics from the bulk. The stabilization of polymorphic metallic phases can occur on a dimensional scale that ranges from single overgrowth layers to repetitive layering at the nanoscale. The sputter deposition of crystalline titanium on nickel, as both a single layer and in multilayer form, has produced a Face-Centered Cubic phase of titanium. The atomic structure of the Face-Centered Cubic titanium phase is examined using high resolution electron microscopy in combination with electron and x-ray diffraction.
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The Stabilization of Face-Centered-Cubic Titanium
MRS Proceedings, 1991Co-Authors: Alan F. Jankowski, Mark A. WallAbstract:The artificial layering of metals can change both physical and structural characteristics from the bulk. The stabilization of such phases often occurs when the component layers are constructed on a nanometric scale. The sequential layering of nickel and titanium has produced the formation of a previously unreported, Face-Centered-Cubic (f.c.c.) phase of titanium.
Kyun Kwon - One of the best experts on this subject based on the ideXlab platform.
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Scaling behavior of the surface energy in Face-Centered Cubic metals
Computational Materials Science, 2014Co-Authors: Young Won Choi, Yang Mo Koo, Kyun KwonAbstract:Abstract The binding energy of metals shows a universal feature which can be described by an equation of state. We explore the scaling behavior of the surface energy in Face-Centered Cubic metals and propose the concept of equivalent structures. The surface energies were calculated on various orientations using the modified embedded-atom method. A strong linear correlation was observed between the surface energies of different metals. Based on the results, we established a scaled surface energy-to-element relationship. This scalability suggests an efficient scheme to estimate the orientation dependency of the surface energy by two characteristic parameters.
Hongqi Li - One of the best experts on this subject based on the ideXlab platform.
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transition of deformation and fracture behaviors in nanostructured face centered Cubic metals
Applied Physics Letters, 2004Co-Authors: Hongqi Li, Fereshteh EbrahimiAbstract:Tensile stress–strain curves demonstrate that single-phase nanocrystalline Face-Centered-Cubic (fcc) metals are intrinsically ductile and their failure begins with necking. However, the area reductions and the fracture behaviors were found to be dependent on the grain size. When plastic deformation is governed by dislocation activity, the nanocrystalline samples behave similar to the conventional coarse-grained materials. As the grain size is reduced to the regime where grain boundary sliding dominates, the material shows very high strain-hardening rate and the tensile samples fail by microcracking with no noticeable reduction in area.
