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Texturing of a TiAl alloy via hot deformation and phase transformations

ABG-94081 Sujet de Thèse
16/10/2020 > 25 et < 35 K€ brut annuel
Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux
METZ - Grand Est - France
Texturing of a TiAl alloy via hot deformation and phase transformations
  • Matériaux
  • Physique
  • Sciences de l’ingénieur
TiAl, texture, microstructure, electron X-ray neutron diffraction

Description du sujet

Driven by the requirements for reducing fuel consumption and CO2 emissions by aero engines and auto engines, TiAl alloys have been developed to meet the challenging requirements, owing to their low density (3.8-4.0g/cm3), high specific strength and stiffness, excellent creep resistance and good resistance against oxidation. The β-solidifying TNM alloys as representative of the third generation γ-TiAl alloys have demonstrated much enhanced wrought processing ability, and improved mechanical properties at elevated temperatures. Recently, it has been evidenced that when the γ lamellae are oriented to the load direction the mechanical properties of the alloys can be greatly increased, thus, lamella orientation control has become an interesting topic for property optimization. Several possibilities exist. All require to deform the alloy at high temperatures. Thus, the proposed PhD topic will focus on the microstructure and texture evolution during hot deformation and variant selection of γ lamellae during α to γ phase transformation of TNM alloys. The aim of this PhD work is to reveal the mechanisms of hot deformation and restoration (recovery and recrystallization) processes and variant selection during phase transformation to finally realize lamella orientation control for the optimization of the mechanical properties.

Prise de fonction :

01/03/2021

Nature du financement

Autre financement public

Précisions sur le financement

Présentation établissement et labo d'accueil

Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux

The Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux, (LEM3, CNRS, Université de Lorraine) located in Metz (France) is a center for experimental and theoretical research combining mechanics of solids and metallurgy. The worldwide scientific excellence of the LEM3-Université de Lorraine was recognized in 2019 by the Shanghai Ranking: 43rd in “Metallurgical Engineering” and 69th in “Mechanical Engineering".

Intitulé du doctorat

Doctorat de Science des Matériaux

Pays d'obtention du doctorat

France

Etablissement délivrant le doctorat

Université de Lorraine

Ecole doctorale

ED C2MP

Profil du candidat

The candidate should be majored in materials science and possess solid background in physical metallurgy and basic knowledge on programing and linear algebra. The candidate should have a good command of English.

Date limite de candidature

31/12/2020
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