Alexandre TanguyÉcole Polytechnique · Laboratoire de Mécanique des Solides
Alexandre Tanguy
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20
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294
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Citations since 2017
Introduction
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Publications
Publications (20)
The compressive resistance of truncated nanocone lattices produced by lithography and etching steps on Si or Ge wafers to get superhydrophobic and antireflective light-transmitting windows, as well as the protection efficiency of alumina or diamond coatings, is investigated by numerical simulations of elastic buckling, and nanocompression tests. Th...
Ultrathin (20 nm) epitaxial films of germanium are deposited on crystalline silicon wafers, to act as virtual substrates for the growth of III-V materials, opening a low-cost approach to tandem solar cells. Such ultrathin layers allow for material cost reduction, along with the possibility of using the silicon wafer as the bottom cell in tandem dev...
Precipitates in an austenitic stainless steel fabricated via any Additive Manufacturing (AM), or 3D printing, technique have been widely reported to be only Mn-Si-rich oxides. However, via Transmission Electron Microscopy (TEM) studies on a 316L stainless steel, we show that non-oxide precipitates (intermetallics, sulfides, phosphides and carbides)...
Precipitates in an austenitic stainless steel fabricated via any Additive Manufacturing (AM), or 3D printing, technique have been widely reported to be only Mn-Si-rich oxides. However, via Transmission Electron Microscopy (TEM) studies on a 316L stainless steel, we show that non-oxide precipitates (intermetallics, sulfides, phosphides and carbides)...
Scanning Electron Microscopes (SEMs) often generate images with a shaded appearance which gives a natural 3D impression. Ergo, quite a few methods to reconstruct the 3D surface topography from these using shape-from-shading methods are available in the literature. Here, a novel approach is discussed which uses BackScatter Electron (BSE) images from...
Deformations within a microstructural gradient zone of stainless steel repaired specimens are investigated. The repair, added material by Directed Energy Deposition over a hot rolled sheet substrate, was tested in monotonic tensile experiments. In situ tests, scanning electron microscope images combined with high resolution digital image correlatio...
Coated sheets for car body are assembled by spot-welding and, more and more, by adhesive bonding. Thus, during life time, the coating endures stresses which can lead to the failure of the whole bonded assembly. The behavior of the zinc coating has then to be primarily studied during tension of flat samples. Several investigation techniques, includi...
Shale swelling can cause a series of problems throughout the exploitation of shale gas. However, due to the complex fabric of shale, a good perception of the shale swelling has not been totally gained. In this paper, an experimental multi-scale approach is employed to characterize the swelling property of a shale from Sichuan basin of China. Wettin...
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A previously introduced mathematical framework for full-field X-ray orientation microscopy is for the first time applied to experimental near-field diffraction data acquired from a polycrystalline sample. Grain by grain tomographic reconstructions using convex optimization and prior knowledge are carried out in a six-dimensional representation of p...
Full-field strain measurement at microscale on geomaterials by means of hydromechanical in situ testing and imaging in an environmental scanning electron microscope and digital image correlation techniques is a challenging task because of both low magnitude of investigated strains (typically of the order of 10−3) and unfavourable imaging conditions...
We measured the humidity-induced swelling of thin self-standing films of montmorillonite clay by a combination of Environmental Scanning Electron Microscopy (ESEM) and Digital Image Correlation (DIC). The films were about 40-microns-thick. They were prepared by depositing and evaporating a suspension of clay and peeling off the highly oriented depo...
AB ST R ACT : An experimental study of the swelling anisotropy of the Callovo-Oxfordian argillaceous rock under hydration is presented. The investigation, which combines environmental scanning electron microscopy (ESEM) and digital image correlation techniques, has been carried out at the micrometric scale of the composite microstructure of the roc...
Projects
Project (1)
The aim of this project is to better understand the non-equilibrium microstructure evolution during the additive manufacturing (AM) process, specifically during the thermal cycling in the heat-affected zone. It is particularly important to study this because (i) the material is subjected to thermal cycling for most of its building time and this must affect the non-equilibrium microstructure (for instance, through the evolution of the chemical and physical heterogeneities found in AM steel microstructures), and (ii) the non-equilibrium phenomena are directly responsible for the enhanced mechanical response of AM materials.
