Glide and mixed climb dislocation velocity in γ-TiAl investigated by in-situ transmission electron microscopy - Archive ouverte HAL Access content directly
Journal Articles Scripta Materialia Year : 2023

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

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  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.
Fichier principal
Vignette du fichier
article_scripta_mat_submission_2.pdf (1.83 Mo) Télécharger le fichier
Origin Files produced by the author(s)

Dates and versions

hal-04281588 , version 1 (13-11-2023)

Identifiers

Cite

Benjamin Galy, Michael Musi, Muriel Hantcherli, Guy Molénat, Alain Couret, et al.. Glide and mixed climb dislocation velocity in γ-TiAl investigated by in-situ transmission electron microscopy. Scripta Materialia, 2023, 228, pp.115333. ⟨10.1016/j.scriptamat.2023.115333⟩. ⟨hal-04281588⟩
48 View
29 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More