Par GDRi Mecano le 22 July 2020 à 10:16
The University Sorbonne Paris Nord (USPN, France) in partnership with the Politecnico di Milano (POLIMI, Italy) are looking for a PhD student on :
Subject: " Towards new multi elemental amorphous thin films with enhanced mechanical properties and thermal stability ''
Thin film metallic glasses (TFMGs) are object of increasing scientific interest due to their excellent mechanicalproperties, e.g. yield strength close to the theoretical limit (>3 GPa) and large elastic deformation (~5%). Moreover, their disordered atomic structure is at the origin of unique functional properties including corrosion resistance and biocompatibility. However, the research on the synthesis and characterization of TFMGs is in a preliminary phase, preferring investigations on bulk counterparts. In this context, this project focuses on synthesis of metallic films with disordered structure at the nanoscale obtained through vapor phase deposition techniques and on the investigation of relationship between atomic structure–mechanical properties–thermal stability.
- TFMG deposition by magnetron sputtering and pulsed laser deposition with different composition and thickness;
- Study of the structural/mechanical properties and thermal stability;
- Design of engineered TFMGs with enhanced mechanical properties/thermal stability and characterization.
Further information and application:
For further information and application please send your CV, your exam scores (bachelor and master) and max 2 reference contacts/letters to: Dr. Matteo Ghidelli (email@example.com) and Prof. Damien Faurie (firstname.lastname@example.org)
More information on the subject, supervision, funding are available in the following document: « PhD position UFI_USPN-POLIMI.pdf »
Par GDRi Mecano le 20 July 2020 à 11:58
Subject: 'Development of a new STEM-in-SEM technique'
You will be registered as PhD Student at the Université de Lorraine and employed by JEOL EUROPE SAS (CIFRE program).
Develop a new cutting-edge technique for characterizing defects by electron microscopy.
Perform detailed analyses of deformation microstructures.
Results will be discussed in the framework of materials science.
Interact with several researchers and engineers.
Publish your work in international scientific journals.
For further information and application resume including addresses of referees and your exam scores (bachelor and master), please contact: Dr. Antoine GUITTON email@example.com; Prof. Emmanuel BOUZY firstname.lastname@example.org
More information on the project are available in the following document: « ApplicationPhD-JEOL-LEM3.pdf »
Par GDRi Mecano le 29 May 2020 à 11:23
The Physics and Mechanics of Materials Department (PDP and SIMAC teams) at the Institut PPRIME is looking for a PhD on:
Mechanical properties of nanotwinned gold thin films
A twin is a portion of a crystal with a particular orientation, for example obtained by a reflection, with respect to a matrix with the same crystalline structure. Twins may appear during plastic deformation, crystal growth or recrystallization. During the last years, nanotwinned materials have been the subject of great interest due to their remarkable mechanical properties: they present large mechanical resistance, ductility and work-hardening capacities. Moreover, they have the same electrical resistivity as coarse grain crystals.
In this context, the “PtyMet” project aims at characterizing the stress field in nanotwinned thin films, and its impact on physical properties. We will combine experiments (X-ray diffraction and transmission electron microscopy) and simulations (molecular statics and dynamics) and focus on single-crystalline nanotwinned gold thin films. From a numerical point of view, atomistic scale simulations are particularly well adapted tools for these studies. They include key materials properties such as the stacking fault and twin boundary energies, allowing precise descriptions of the defect configurations (e.g. dislocations, grain boundaries, twins). Furthermore, atomic scale simulations and experiments are now working on converging spatial scales. From the experimental point of view, X-ray diffraction can be used to determine the twinned volume (via pole figures) or the stress state in the sample (via Bragg peaks displacement). Moreover, using a coherent X-ray beam allows the characterization of single crystalline defects such as dislocations or twins.
Optimization of the deposition conditions is mandatory in order to prepare homogeneous thin films, without other defects than the twins.The films’ microstructure before deformation will be precisely characterized.Simultaneously, atomic scale simulations will be used to establish the elastic strain field associated with different nanotwinned thin film microstructures. Equilibrium conditions will be determined using semi-empirical potentials, that are reliable for gold. The impact of the twins’ density and thickness will be studied.Finally,in-situ tensile tests at synchrotron radiation sources, using both classical and coherent X-ray diffraction,will be performed. This, together with atomic scale simulations,will allow a full characterization, from the atomic to the macro-scale, of the mechanical properties of nanotwinned gold thin films.
The applicant should hold a master degree in solid-state physics or materials science. He/she should show a shared interest in computer simulations and in experimental work. Skills in atomic scale simulations and / or X-ray diffraction will be an asset.
send a CV and a cover letter to the contacts below.
Sandrine BROCHARD email@example.com
Pierre GODARD firstname.lastname@example.org
More information (and a french version) are available in the following document: these_PhD_PtyMet_nanotwins.pdf »
Par GDRi Mecano le 29 May 2020 à 11:23
This post-doctoral position is to be held at FEMTO-ST (www.femto-st.fr), within the Dpt. Of Applied Mechanics. FEMTO-ST is a joint research unit which is affiliated with the French National Centre of Scientific Research (CNRS), the University of Franche-Comté (UFC), the National School of Mechanical Engineering and Microtechnology (ENSMM), and the Belfort-Montbéliard University of Technology (UTBM).
This part of the CAVHYTATION project is intended to provide new insights in chemo-mechanical couplings at the microscale, in order to assess the potentialities of innovative micromechanical sensors. Micromechanical structures have been realized and a dedicated surface chemistry is under validation in order to provide a representative model system. As a post-doc in the PMMCM group, you will be in charge of two innovative experiments intended to probe the fine-scale deformation of the structures when their surface undergoes a chemical modification. One of these experiments is to be conducted together with a group operating at SOLEIL. These fine-scale displacements are crucial to elucidate the role of the material in the chemo-mechanical transduction.
The applicant is expected to have significant background and extensive experience as experimentalist. Experience in multidisciplinary environments would be greatly appreciated. Excellent communication skills as well as a team-oriented attitude are requested
Further information may be obtained from Fabien Amiot (email@example.com).
Information on duration and application are available in the following document: « profile_cavhytation.pdf »
Par GDRi Mecano le 29 May 2020 à 11:22
Synthesis, mechanical properties and biodegradability of thin films metallic glasses
The study of amorphous metal films (thin film metallic glasses, TFMGs) is receiving more and more attention due to the excellent mechanical properties: a tensile strength close to theoretical limit, high hardness and elastic deformation. Their disordered atomic structure is the source of unique physical properties that are different from their crystalline counterparts. However, studies on the synthesis and characterization of TFMGs are relatively recent, as efforts have focused on the bulk metallic glasses (BMGs). In this context, the main goal of the study is the TFMGs synthesis by magnetron sputtering on flexible polymer substrates with a structure totally or partially disordered at the nanometric scale. Structural-mechanical relationship will be identify trough the combination of x-ray diffraction, scanning electron microscope, nanoindentation, optoacoustic techniques and micro-tensile tests of films on flexible polymeric substrates. We aim to establish correlation between the elastic and plastic properties of TFMGs, and contribute to a better understanding of the microstructures and local atomic ordering influence on their mechanical properties. In addition, one application of these coatings in the biomedical field is considered, in partnership with the Laboratory for Translational Vascular Research (LVTS, INSERM U1148, Pr. F. Chaubet) who will perform specific biocompatibility tests (cells growth,…).
PhD tasks :
(i) coatings with thin films of metallic glasses on flat polymeric supports (Kapton or elastomer sheets) and curved structures of polymers obtained by 3D printing;
(ii) study of the structural and mechanical properties of hybrid materials, in particular at the polymermetal interface,
(iii) control of their degradation kinetics in simulated biological medium,
(iv) in the context of a biomedical application, the evaluation of their mechanical properties in relation to the absorption of the materials constituting the hybrid,
(v) evaluation of compatibility with human vascular cells (collaboration with the LVTS , Pr. F. Chaubet).
Further information and application:
Supervision: Prof. Philippe Djemia (LSPM, Université Sorbonne Paris Nord),
Co-supervision: Dr. Fatiha Challali, Dr. Florent Tétard
Financial support: MESR Grant (starting on September 1th 2020; 3 years duration).
Start date: September 1st 2020
More detail on the subject and information on application are available in the following document: « PhD offer-Thin film Metallic glass-LSPM-2020.pdf »
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