Skip to Main content Skip to Navigation
Theses

Évolution des microstructures et mécanismes de densification d'un alliage TiAl lors du frittage par Spark Plasma Sintering

Abstract : This work focuses on the microstructure evolution of a TiAl alloy during sintering by a process called Spark Plasma Sintering (SPS). The initial powders, elaborated by atomization, consist primarily of a metastable phase. The transformations of the return to equilibrium of the latter during heating are finely characterized using SEM, TEM and EBSD. These phase transformations are then used as a thermal indicator during the SPS densification to estimate the thermal and mechanical gradients. The densification mechanisms responsible for the neck formation and the origins of the microstructure heterogeneities of fully densified samples are discussed. A comparison between the densification mechanisms and the final microstructures of a milled powder and a no milled powder is showed. Finally, the effect of the application of a dynamic stress during the compaction using an original process is presented
Document type :
Theses
Complete list of metadatas

Cited literature [192 references]  Display  Hide  Download

https://hal.univ-lorraine.fr/tel-01754510
Contributor : Thèses Ul <>
Submitted on : Friday, March 30, 2018 - 9:51:45 AM
Last modification on : Friday, October 23, 2020 - 4:59:04 PM

File

DDOC_T_2015_0244_GUYON.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01754510, version 1

Citation

Julien Guyon. Évolution des microstructures et mécanismes de densification d'un alliage TiAl lors du frittage par Spark Plasma Sintering. Autre. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0244⟩. ⟨tel-01754510⟩

Share

Metrics

Record views

60

Files downloads

763