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PhD offer (H/F)

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Français - Anglais

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General information

Reference : UMR8247-FREPRI-001
Workplace : PARIS 05
Date of publication : Wednesday, June 17, 2020
Scientific Responsible name : Frédéric PRIMA
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 October 2020
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

Development of new oxygen-tolerant titanium alloys

Among the various significant questions affecting titanium metallurgy, the effect of oxygen on the mechanical properties of titanium alloys remains one of the most critical issues. A small addition of oxygen is known to induce a strong hardening resulting in a large increase of strength but also a drastic drop of ductility leading to embrittlement. It has been shown recently that it is possible to add oxygen to a titanium alloy consisting of a binary Ti-Zr solid solution, to obtain the classical oxygen hardening contribution without any loss of ductility. The main addressed objective of this PhD project is to provide a comprehensive map of the mechanisms connecting the alloy's chemistry both to the development of atomic-scale structure of these materials and to the effective deformation mechanisms, thus clarifying their macroscopic mechanical behavior at room and high temperature, respectively.
In that context, the proposal is based on a multi-scale approach and will explore three main aspects from the experimental points of view:
⎫ The determination of the atomic-scale structure of Ti-Zr-O alloys as a function of the chemical composition, with special attention to possible local ordering using high-resolution experimental characterization (synchrotron radiation source in Soleil).
⎫ The sensitivity of the mechanical behavior to the alloy composition, with respect to both the oxygen (up to 0.8 wt%), the Zr content (from 0 to 10 wt%) and compared to the binary Ti-O system.
⎫ The impact of oxygen content on the operative deformation mechanisms, at room and elevated temperature (up to 700°C).

This PhD work is part of a larger project, ANR TiTol, involving four different French laboratories (IRCP Chimie ParisTech, ICMPE Univ. Paris Est, Diffabs Soleil, and SRMP CEA Saclay). It will benefit from multiple interactions with modeling work performed inside the project. In particular, predictions of the modeling approaches will be directly compared to high energy X-ray diffraction experiments, TEM observations, and in situ resistivity evolutions. The work will be performed in close collaboration with ICMPE Univ. Paris Est (co-supervision with Prof. Ivan Guillot)

Laboratory: IRCP (Group of Structural Metallurgy), is part of Chimie ParisTech, as an interdisciplinary research unit located in the center of Paris and is easily connected by public transportation.
More information on Chimie ParisTech: https://www.chimieparistech.psl.eu

Contact: Prof. Frédéric Prima (frederic.prima@chimieparistech.psl.eu), IRCP, Chimie ParisTech

Time frame: The position is available in October 2020 and the funding is for three years.

Qualification: The applicant should hold a master degree (or equivalent) in materials science, with skills in one or more of the following fields:
- Phase transformation in metallic materials
- Mechanical properties of metallic materials
- High energy synchrotron experiments

How to apply: Candidates should send their application (statement of research interest, CV, names and contact information of two references) to frederic.prima@chimieparistech.psl.eu

Work Context

Laboratory: IRCP (Group of Structural Metallurgy), is part of Chimie ParisTech, as an interdisciplinary research unit located in the center of Paris and is easily connected by public transportation.
More information on Chimie ParisTech: https://www.chimieparistech.psl.eu

Contact: Prof. Frédéric Prima (frederic.prima@chimieparistech.psl.eu), IRCP, Chimie ParisTech

Constraints and risks

A specific training session on DiffsAbs beamline will be required

Additional Information

No additional specific comment.

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