Emeric Plancher

Emeric Plancher
Constellium · C-TEC

PhD

About

23
Publications
4,537
Reads
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423
Citations
Additional affiliations
January 2018 - present
Grenoble Institute of Technology
Position
  • PostDoc Position
June 2016 - December 2017
Massachusetts Institute of Technology
Position
  • PostDoc Position
September 2012 - December 2015
Ecole Nationale Supérieure d'Arts et Métiers
Position
  • PhD Student

Publications

Publications (23)
Preprint
Full-text available
Stress-induced martensitic transformations enable metastable alloys to exhibit enhanced strain hardening capacity, leading to improved formability and toughness. As is well-known from transformation-induced plasticity (TRIP) steels, however, the resulting martensite can limit ductility and fatigue life due to its intrinsic brittleness. In this work...
Article
A pragmatic design strategy to achieve unusual mechanical responses in metal lattice structures is deployed. This strategy, referred to as behavior by design, is illustrated with an architectured material fabricated to provide a ''whistle-blower" mechanical response under tensile loading. Struts with unusual geometries, e.g. dog-bone struts and cor...
Article
Stress-induced martensitic transformations enable metastable alloys to exhibit enhanced strain hardening capacity, leading to improved formability and toughness. As is well-known from transformation-induced plasticity (TRIP) steels, however, the resulting martensite can limit ductility and fatigue life due to its intrinsic brittleness. In this work...
Article
Full-text available
Corrugated struts as part of lattice structures can lead to novel mechanical behavior by a combination of material and geometrical hardening. The unfolding behavior of such struts offers a potential of large macroscopic straining. However, their ability to be unfolded is impacted by the surface characteristics inherited from the additive manufactur...
Article
Hydrogen uptake in titanium alloys leads to the formation of hydride phases, which in-turn cause severe embrittlement upon further deformation. The embrittlement micro-mechanisms are complicated by the distinct hydrogen diffusion and solution characteristics of the α and β phases, which arise from their different crystal structures. To improve the...
Preprint
Full-text available
Synchrotron Laue microdiffraction and Digital Image Correlation measurements were coupled to track the elastic strain field (or stress field) and the total strain field near a general grain boundary in a bent bicrystal. A 316L stainless steel bicrystal was deformed in situ into the elasto-plastic regime with a four-point bending setup. The test was...
Article
Time-resolved in situ microtomography is employed to track the nucleation and growth of individual pores during solidification of a commercial nickel-based superalloy. Three cooling rates (0.1, 0.5 and 1 °C/s) are investigated to evaluate the effect of this key processing parameter on the formation of porosity. Phase contrast obtained with a cohere...
Article
In this work, a novel method is presented to track site-specific microstructure evolution in metallic materials deformed biaxially along proportional and complex strain paths. A miniaturized bulge test setup featuring a removable sample holder was designed to enable incremental measurements to be performed in a scanning electron microscope, by prob...
Article
Synchrotron Laue microdiffraction and digital image correlation measurements were coupled to track the elastic strain field (or stress field) and the total strain field near a general grain boundary in a bent bicrystal. A 316L stainless steel bicrystal was deformed in situ into the elasto-plastic regime using a four-point bending setup. The test wa...
Article
Avoiding FIB damage using the “umbrella” method - Volume 25 Supplement - C.C. Tasan, T. Vermeij, E. Plancher
Article
Ti-6Al-4V thin struts, built by selective electron beam melting have been submitted to hot isostatic pressing and further processed with ultrasonic shot peening to investigate the effect of this surface treatment on surface defects. The consequence of those surface defects on the fatigue resistance of thin struts has been evaluated before and after...
Article
Full-text available
A design strategy, referred to as behavior by design, was introduced to develop novel architectured materials starting from their expected stress-strain response. Target behaviors in this strategy have unusual shapes that provide new functions to the material. Here, a numerical toolbox was employed to predict the geometry of metal tensile samples w...
Article
Focused ion beam (FIB) milling has enabled the development of key microstructure characterization techniques (e.g. 3D electron backscatter diffraction (EBSD), 3D scanning electron microscopy imaging, site- specific sample preparation for transmission electron microscopy, site-specific atom probe tomography), and micro-mechanical testing techniques...
Article
Full-text available
Multiscale models involving crystal plasticity are essential to predict the elastoplastic behavior of structural materials with respect to their microstructure. However, those models are often limited by a poor knowledge of the local constitutive behavior. This article reports a method to measure the mechanical behavior directly, at the micrometre...
Poster
Full-text available
A masking technique to perform high accuracy diffraction experiments on FIB-machined specimens: we investigate and prevent damage on a surface near FIB milled features.
Article
Full-text available
Determining the accuracy of elastic strain measurements in plastically deformed alloys is an experimental challenge. To develop a novel cross-validation procedure, a controlled elasto-plastic strain gradient was created in a stainless steel single crystal by four point bending deformation. The corresponding elastic strain field was probed, with an...
Thesis
Full-text available
La connaissance du comportement mécanique à l’échelle du micron est déterminante pour arriver à prédire la dégradation des matériaux. Dans le cas des polycristaux, les lois de plasticité cristalline sont généralement utilisées pour décrire le comportement d’un grain. Ces lois possèdent de nombreux paramètres qui doivent être ajustés à l’état métall...
Article
Full-text available
A new method of determining the deviatoric elastic strain and lattice orientation from Laue microdiffraction images is presented. Standard data treatment methods can suffer from the difficulty of precisely pinpointing the positions of diffraction peaks on two-dimensional Laue images. In a previous article, digital image correlation (DIC) was introd...
Poster
Full-text available
Following the pioneering work of Troost et al. [1] Wilkinson and co-workers [2, 3] have proposed an elegant method for evaluating strain and rotation by using digital image correlation techniques applied to Electron BackScattered Diffraction Patterns. Over the past five years, intensive developments of this High Angular Resolution-EBSD technique ha...
Article
The excellent mechanical properties of the Ti–Nb-based gum metal were originally proposed to arise from a “dislocation-free” giant fault mechanism; however, the involvement of lattice dislocations in the process is still under debate. To address this issue, gum metal deformation mechanisms are investigated systematically on cast specimens, employin...
Article
To understand and improve the fire retardancy behavior of polylactic acid, we have incorporated two structurally different additives, sepiolite and organically modified montmorillonite. A novel approach (combination of electrospinning and extrusion/injection molding) is employed to address critical issues like char enhancement as well as the homoge...

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