Dislocation dipole-induced strengthening in intermetallic TiAl

Narrow dislocation dipoles in intermetallic TiAl are systematically investigated by atomic-scale simulations and electron microscopy. The formation energy of narrow dipolar configurations and the activation energy during their evolution are unraveled. We show that faulted dipoles can be stable over...

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Bibliographic Details
Published inScripta materialia Vol. 143; pp. 98 - 102
Main Authors He, Yan, Liu, Zhao, Zhou, Gang, Wang, Hao, Bai, Chunguang, Rodney, David, Appel, Fritz, Xu, Dongsheng, Yang, Rui
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.01.2018
Elsevier
Subjects
Atomistic simulation
Chemical Sciences
Dislocation
Engineering Sciences
Faulted dipole
Intermetallics
Physics
Plasticity
Atomistic simulation
Intermetallics
Plasticity
Faulted dipole
Dislocation
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Summary:Narrow dislocation dipoles in intermetallic TiAl are systematically investigated by atomic-scale simulations and electron microscopy. The formation energy of narrow dipolar configurations and the activation energy during their evolution are unraveled. We show that faulted dipoles can be stable over experimental timescales, in full agreement with high-resolution observations. Such stable atomic-scale structures provide a strengthening effect significantly larger than the elastic prediction, which deeply influences plasticity in TiAl. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2017.09.010