The Experts below are selected from a list of 183 Experts worldwide ranked by ideXlab platform
Steven M. Wise - One of the best experts on this subject based on the ideXlab platform.
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Phase decomposition of a binary thin film on a patterned substrate
Applied Physics Letters, 2002Co-Authors: William C. Johnson, Steven M. WiseAbstract:Two-dimensional simulations of phase decomposition in a binary thin film, which is deposited on a patterned substrate, are performed using the Cahn–Hilliard equation. Phase formation, growth, coarsening, and the resulting two-phase microstructure are strongly influenced by the substrate geometry, film composition, and surface effects. Patterning the substrate can result in the formation of self-organized structures of various sizes and spacings and may provide a method for developing monolayers of periodic nanostructures from an initially Homogeneous Alloy.
William C. Johnson - One of the best experts on this subject based on the ideXlab platform.
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Phase decomposition of a binary thin film on a patterned substrate
Applied Physics Letters, 2002Co-Authors: William C. Johnson, Steven M. WiseAbstract:Two-dimensional simulations of phase decomposition in a binary thin film, which is deposited on a patterned substrate, are performed using the Cahn–Hilliard equation. Phase formation, growth, coarsening, and the resulting two-phase microstructure are strongly influenced by the substrate geometry, film composition, and surface effects. Patterning the substrate can result in the formation of self-organized structures of various sizes and spacings and may provide a method for developing monolayers of periodic nanostructures from an initially Homogeneous Alloy.
Didier Zanghi - One of the best experts on this subject based on the ideXlab platform.
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Chemical short-range order in liquid Al-Ni Alloys.
The Journal of chemical physics, 2008Co-Authors: Ivan Egry, Louis Hennet, Mirko Kehr, G. Mathiak, Simone De Panfilis, I. Pozdnyakova, Didier ZanghiAbstract:The chemical short-range structure was studied in liquid Al–Ni Alloys by x-ray absorption spectroscopy as a function of temperature and composition. A containerless technique, combining aerodynamic levitation and inductive heating, was used to position and melt the samples. The fluorescence yield x-ray absorption at the Ni K edge was measured by a multichannel solid-state Ge detector. The number of heteroatomic pairs around the scatterer is higher than for a Homogeneous Alloy.
Eric Aime Jagle - One of the best experts on this subject based on the ideXlab platform.
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laser powder bed fusion as an Alloy development tool parameter selection for in situ Alloying using elemental powders
Materials, 2020Co-Authors: Leonardo Shoji Aota, Priyanshu Ajaj, H R Z Sandim, Eric Aime JagleAbstract:The design of advanced Alloys specifically tailored to additive manufacturing processes is a research field that is attracting ever-increasing attention. Laser powder-bed fusion (LPBF) commonly uses pre-Alloyed, fine powders (diameter usually 15–45 µm) to produce fully dense metallic parts. The availability of such fine, pre-Alloyed powders reduces the iteration speed of Alloy development for LPBF and renders it quite costly. Here, we overcome these drawbacks by performing in-situ Alloying in LPBF starting with pure elemental powder mixtures avoiding the use of costly pre-Alloyed powders. Pure iron, chromium, and nickel powder mixtures were used to perform in-situ Alloying to manufacture 304 L stainless steel cube-shaped samples. Process parameters including scanning speed, laser power, beam diameter, and layer thickness were varied aiming at obtaining a chemically Homogeneous Alloy. The scientific questions focused on in this work are: which process parameters are required for producing such samples (in part already known in the state of the art), and why are these parameters conducive to homogeneity? Analytical modelling of the melt pool geometry and temperature field suggests that the residence time in the liquid state is the most important parameter controlling the chemical homogeneity of the parts. Results show that in-situ Alloying can be successfully employed to enable faster and cost-efficient rapid Alloy development.
Yufeng Zheng - One of the best experts on this subject based on the ideXlab platform.
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high damping capacity in a wide temperature range of a compositionally graded tini Alloy prepared by electroplating and diffusion annealing
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2015Co-Authors: Yufeng Zheng, Y X Tong, F Chen, B Tian, H M ZhouAbstract:Abstract A compositionally graded TiNi Alloy was prepared by electroplating of Ni coating on TiNi substrate and diffusion annealing. The temperature range with damping capacity of larger than 0.04 was enlarged to above 110 °C for the compositionally graded Alloy, which was almost 5 times of that for the Homogeneous Alloy.