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

Guy Molénat, Jean-Philippe Monchoux, Michael Musi, Petra Spörk-Erdely, Helmut Clemens, Alain Couret

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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 nano-sized precipitates of the ω o phase. In situ room temperature straining experiments show that dislocation propagation occurs through jumps between these elongated configurations.

Original languageEnglish
Article number115247
Number of pages6
JournalScripta materialia
Issue number15 March
Early online date21 Dec 2022
Publication statusPublished - 15 Mar 2023

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