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

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

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.

OriginalspracheEnglisch
Aufsatznummer115247
Seitenumfang6
FachzeitschriftScripta materialia
Jahrgang226.2023
Ausgabenummer15 March
Frühes Online-Datum21 Dez. 2022
DOIs
PublikationsstatusVeröffentlicht - 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.

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