Glide and mixed climb dislocation velocity in γ-TiAl investigated by in-situ transmission electron microscopy

Publikationen: Beitrag in FachzeitschriftArtikelForschung(peer-reviewed)

Autoren

  • Benjamin Galy
  • Muriel Hantcherli
  • Guy Molénat
  • Alain Couret
  • Jean-Philippe Monchoux

Organisationseinheiten

Externe Organisationseinheiten

  • Université de Toulouse

Abstract

Dislocation velocities at high temperatures in metallic systems are believed in literature to be different for glide and climb, the values being bigger in case of glide. However, this has not been experimentally established. Therefore, in this study, dislocation velocities were measured with simultaneous determination of the corresponding mechanism (glide or mixed climb). For this purpose, coupled experiments of measurements of dislocation velocities by in-situ TEM investigations and of determination of movement planes by stereographic analyses have been carried out at 770–790 °C in the γ phase of an intermetallic Ti-48.4Al-0.1B (at.%) alloy. Mixed climb and pure glide mechanisms have thus been identified, both leading to dislocation velocities in the same order of magnitude (in the 0.5–5 nm/s range), showing that within a transition temperature domain, mixed climb can reach the velocity of glide.

Details

OriginalspracheEnglisch
Aufsatznummer115333
Seitenumfang8
FachzeitschriftScripta materialia
Jahrgang228.2023
Ausgabenummer15 April
Frühes Online-Datum31 Jan. 2023
DOIs
StatusVeröffentlicht - 15 Apr. 2023