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Journal Articles Scripta Materialia Year : 2022

A TEM study of a<001> dislocations in the ßo phase of an intermetallic TNM-TiAl alloy

Abstract

The structure and mobility of a<001> dislocations in the β o phase of an intermetallic TNM-TiAl alloy produced by Spark Plasma Sintering were investigated by transmission electron microscopy. We find that these dislocations are dissociated into two identical superpartial dislocations separated by a stacking fault. Furthermore, a<001> dislocations are elongated along their screw orientation and anchored at small pining points assumed to be nanosized precipitates of the ω o phase. In situ room temperature straining experiments show that dislocation propagation occurs through jumps between these elongated configurations.
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Dates and versions

hal-04283350 , version 1 (15-11-2023)

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Guy Molénat, Jean-Philippe Monchoux, Michael Musi, Petra Spoerk-Erdely, Helmut Clemens, et al.. A TEM study of a<001> dislocations in the ßo phase of an intermetallic TNM-TiAl alloy. Scripta Materialia, 2022, 226, ⟨10.1016/j.scriptamat.2022.115247⟩. ⟨hal-04283350⟩
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