A TEM study of a<001> dislocations in the ßo phase of an intermetallic TNM-TiAl alloy. (15th March 2023)

• Record Type: Journal Article
• Authors: Molénat, Guy; Monchoux, Jean-Philippe; Musi, Michael; Spoerk-Erdely, Petra; Clemens, Helmut; Couret, Alain
• Is Part Of: Scripta materialia. Number 226(2023)
• Publication Date: 2023-03-15
• Subjects: TNM TiAl alloy -- Dislocations -- Transmission electron microscopy -- Dissociation of dislocations -- Nano-sized precipitates; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.115247
• Languages: English
• ISSNs: 1359-6462

Abstract

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. Graphical abstract: Image, graphical abstract