• Sujet de thèse: 'Étude des mécanismes élémentaires de déformation plastique d'alliages métalliques multi-composant dits de haute entropie de structure cubique centrée'

    Détails:

    Le travail proposé consiste à étudier des propriétés mécaniques d'alliages Nbx(HfTaTiZr)100-x de structure cubique centrée dans la gamme 20<x<100 (at.%). La stratégie vise à identifier les spécificités intrinsèques de ces solutions solides concentrées en étudiant l'impact des substitutions élémentaires sur le comportement mécanique des matériaux obtenus. L'évolution des mécanismes de déformation sous-jacents sera évidemment placé au cœur de l'étude proposée et effectuée principalement par microscopie électronique en transmission (MET) in situ.

    La thèse se déroulera en grande partie à l'ICMPE avec un ou plusieurs séjours de longue durée au CEMES à Toulouse. Des séjours seront également prévus à l'Université de Bochum, en Allemagne, dans le cadre de la réalisation d'essais mécaniques spécifiques sur ces alliages.

    Profil:

    Le/La candidat.e recruté.e devra démontrer un cursus solide en sciences des matériaux avec un excellent niveau en Master 2/École d'Ingénieur.

    Date importante:

    Début de la thèse: 1 Octobre 2019

    Date limite de candidature: 31 Mai 2019

    Encadrement:

    Jean-Philipe Couzinié (MCF HDR, couzinie@icmpe.cnrs.fr) et Frederic mompiou (CR HDR, frederic.mompiou@cemes.fr). Les équipes LSPM (CNRS, UPR3407) de l'Université Paris 13 et de l'Institut für Werkstoffe de l’Université de la Ruhr (Bochum, Allemagne) seront également partenaires au cours de cette thèse sous l'encadrement de Guy Dirras (Pr., dirras@lspm.cnrs.fr) et Guillaume Laplanche (guillaume.laplanche@rub.de), respectivement.

    Plus d'informations sont diponibles dans le document ci-joint: « Thèse_ICMPE 2019.pdf »


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  • The Ceramics group at the Department of Materials and Earth Science at TU Darmstadt, Germany, is offering a PhD Student position for a DFG (Deutsche Forschungsgemeinschaft) funded project on:

    “Understanding stress-oxidation interaction on grain boundary failure: in situ microscale crack propagation experiments”.

    Your tasks:

    The project involves experimental work and you will be responsible for preparing micro-cantilevers using focused ion beam (FIB), and testing them under coupled/de-coupled mechanical and thermal oxidation conditions using nanoindentation technique. In addition, you will also work in close collaboration with leading research groups (at TU Darmstadt, Max-Planck-Institut für Eisenforschung, and abroad) on structural investigations using high resolution scanning electron microscopy for characterization of microstructure (mainly grain boundaries) using transmission electron microscopy.

    Your profile:

    Essential requirements:

    • Excellent Master degree in Engineering Mechanics, Materials Science, or Applied Physics.

    • Strong interest in scientific research and above-average motivation to manage the PhD project.

    • Very good knowledge of spoken and written English.

    Desired skills:

    • Strong academic background in one or more of the following subjects: solid mechanics (preferably fracture mechanics), solid state physics, high temperature oxidation, metallurgy.

    • Prior experience or Master thesis in a related topic/field of research.

    • Hands-on experience in one or more of the following topics: nanoindentation, SEM, EBSD, micro-mechanical testing, finite element simulation.

    • Publications in peer-reviewed journal.

    • Demonstrated ability for independent scientific research.

    Application:

    Applications should include scientific CV (including list of publications in peer-reviewed journals, if any), courses and grades, motivation letter, recommendation letters and contact data from two references.

    Please send applications to: fang@ceramics.tudarmstadt.de

    Application deadline: May 31, 2019

    More information can be found in the following document: « PhD position in TU Darmstadt_2019.pdf »


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  • Description:

    In the framework of a three-year project founded by the ANR (French Agency for Research), you will be responsible of different tasks related to in situ TEM nanocompression experiments. The main objective of the project is related to the improvement of the accuracy when measuring the mechanical properties of nanoparticles. It will consist in crossing and linking the results obtained by different techniques (in situ compression inside a transmission electron microscope (TEM) and Brillouin spectroscopy performed under pressure) to better identify the different sources of error inherent to these experimental techniques. Experimental results will be compared to reference data obtained from numerical simulations.  A real coupling of experimental devices will then be performed by adapting the TEM sample holder on a Brillouin spectrometer, so that both techniques can be used to measure the mechanical properties of the same nanoparticle

    You will be in charge of the measurements performed by both techniques on the same nanoparticle by using the TEM sample holder on the spectrometer. You will work in both laboratories involved in the project (MATEIS laboratory at INSA Lyon and ILM laboratories at University Claude Bernard Lyon 1), making the link between both techniques. The measurement by Brillouin spectrometer on a nanometer-size nanoparticle on the TEM sample holder requires an optimized substrate (with a precise localization of the nanoparticle on the substrate). The substrate will be prepared by Focused Ion Beam  nanostructuration. You might also be in charge of the substrate nanostructuration in strong relation with the staff in charge of the Focused Ion Beam.

    Requirements:

    -PhD in material sciences, in physics in which the focus of your project was on transmission electron microscopy.

    -At least 2 years well-documented, hands-on expertise in high resolution transmission electron imaging. TEM in situ nanocompression experiments would be a plus.

    -Proficiency in spoken and written English, French is an asset.

    -Capacity for interdisciplinary and international teamwork and excellent communication skills.

    -Excellent publication records.

    -Documented experience in elastic/plastic behavior of materials and the determination of mechanical properties.

    Starting date: 1st September, 2019.

    Fixed term: 18 months.

    Your application MUST contain the following information: Cover letter of  maximum 2 pages  that should include (1) a statement about the research you have done, and (2) how you fit the above described tasks and qualifications. CV including a publication list and coordinates of at least 2 referees. And has to be sent to lucile.joly-pottuz@insa-lyon.fr and karine.masenelli-varlot@insa-lyon.fr 


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  • Empa is the research institute for materials science and technology of the ETH Domain and conducts cutting-edge research for the benefit of industry and the well-being of society.

    The Laboratory for Mechanics of Materials and Nanostructures is looking for :

    - Post-doc’s in the field of mechanical properties of thin films and miniature components:

    Your tasks:

    You will work on research projects funded by the InnoSuisse agency and by large scale European programs to scientifically explore mechanical properties of thin films and miniature components. The project is in close collaboration with a former start-up company on the same campus that develops nanomechanical testing equipment for extreme testing conditions of variable temperature and high speeds. You’ll be involved in a number of projects running in other groups of the laboratory that aim at the synthesis of novel thin films based on atomic layer deposition, physical vapor deposition or electrochemical deposition techniques, that engineer miniature components such as watch or MEMS components or that manufacture miniature components via 3D printing approaches. Outstanding candidates will also be given the opportunity to apply to a number of prestigious fellowships during their employment at Empa.

    Your profile:

    You must hold a PhD in Physics, Materials Science, Mechanical Engineering, Microengineering or similar. Experience in one or more of the following techniques is a requirement: nanoindentation, small scale mechanical testing such as microcompression testing, finite element simulations. A high motivation to work at the leading edge of measurement science and to work in international and multidisciplinary research teams are essential. Knowledge of English (oral and written) is important and knowledge of German would be an advantage.

    For further information about the position please contact: Dr. Johann Michler, Johann.Michler@empa.ch and visit the following websites: www.empa.ch/web/s206

    Online application including a letter of motivation, CV, diplomas with transcripts and contact details of two referees. Please upload the requested documents through the webpage. Applications via email will not be considered.


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  • A one-year post-doctoral position is available at the Laboratory for Processing of Advanced Composites (LPAC, Institute of Materials, EPFL).

    Description:

    The objective is to analyze the mechanical integrity of Parylene-based hybrid multilayer materials, in close collaboration with the EPFL Laboratory for Soft Bioelectronic Interfaces (LSBI)and the company Comelec.

    He or she will integrate a team of specialists in thin film devices processing and characterization and will be responsible for:

    • The experimental characterization of the multilayer structures and their mechanical and diffusion barrier properties using state of the art methods;

    • The optimization of the multilayer structure in view of their application to soft bioelectronic devices.

    Profile:

    The candidate must possess a solid background in materials science, with a good knowledge of thin film mechanics. And mastering of the English language is required.

    Application: 

    Applications including a CV, a motivation letter and the names and contact details of three reference persons should be directed to: Dr. Yves Leterrier, yves.leterrier@epfl.ch.

    More information in the following document : « LPAC-EPFL Postdoctoral position on multilayer thin film devices.pdf »


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