TY - JOUR

T1 - Glide and mixed climb dislocation velocity in γ-TiAl investigated by in-situ transmission electron microscopy

AU - Galy, Benjamin

AU - Musi, Michael

AU - Hantcherli, Muriel

AU - Molénat, Guy

AU - Couret, Alain

AU - Spörk-Erdely, Petra

AU - Clemens, Helmut

AU - Monchoux, Jean-Philippe

N1 - Publisher Copyright: © 2023

PY - 2023/4/15

Y1 - 2023/4/15

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85147428058&partnerID=8YFLogxK

U2 - 10.1016/j.scriptamat.2023.115333

DO - 10.1016/j.scriptamat.2023.115333

M3 - Article

VL - 228.2023

JO - Scripta materialia

JF - Scripta materialia

SN - 1359-6462

IS - 15 April

M1 - 115333

ER -