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

Lehrstuhl für Metallkunde (420)

Université de Toulouse

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Begutachtung

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.

Originalsprache	Englisch
Aufsatznummer	115247
Seitenumfang	6
Fachzeitschrift	Scripta materialia
Jahrgang	226.2023
Ausgabenummer	15 March
Frühes Online-Datum	21 Dez. 2022
DOIs	https://doi.org/10.1016/j.scriptamat.2022.115247
Publikationsstatus	Veröffentlicht - 15 März 2023

Bibliographische Notiz

Funding Information:
This study has been conducted in the framework of the cooperative Austrian-French project “Hi-TiAl - 18-CE91-0008-01” jointly supported by the French Agence Nationale de la Recherche (ANR) and the Fonds zur Förderung der wissenschaftlichen Forschung (FWF). M. Musi is a Recipient of a DOC Fellowship of the Austrian Academy of Sciences at the Department of Materials Science, Montanuniversität Leoben.

Funding Information:
This study has been conducted in the framework of the cooperative Austrian-French project “Hi-TiAl - 18-CE91-0008-01” jointly supported by the French Agence Nationale de la Recherche (ANR) and the Fonds zur Förderung der wissenschaftlichen Forschung (FWF). M. Musi is a Recipient of a DOC Fellowship of the Austrian Academy of Sciences at the Department of Materials Science, Montanuniversität Leoben.

Publisher Copyright:
© 2022

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