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

doi:10.1016/j.scriptamat.2022.115247

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

Chair of Physical Metallurgy (420)

Université de Toulouse

Research output: Contribution to journal › Article › Research › peer-review

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 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 language	English
Article number	115247
Number of pages	6
Journal	Scripta materialia
Volume	226.2023
Issue number	15 March
Early online date	21 Dec 2022
DOIs	https://doi.org/10.1016/j.scriptamat.2022.115247
Publication status	Published - 15 Mar 2023

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10.1016/j.scriptamat.2022.115247

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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 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.",

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AU - Molénat, Guy

AU - Monchoux, Jean-Philippe

AU - Musi, Michael

AU - Spörk-Erdely, Petra

AU - Clemens, Helmut

AU - Couret, Alain

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N2 - 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.

AB - 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.

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JO - Scripta materialia

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IS - 15 March

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ER -

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

Abstract

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