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2015 | 128 | 4 | 564-569
Article title

Composite Particles Formation and Behaviour in Al-Li Alloys Alloyed by Sc (Zr) under Heat Treatment and Severe Plastic Deformation

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EN
Abstracts
EN
The mechanism and kinetics of Al₃Li/Al₃Sc composite particles formation during aging of triple Al-Li-Sc alloys were studied. The particles of such type consist of two isomorphic phases, ordered by L1₂ type. Composite particles in Al-Li-Sc are formed by epitaxial nucleation of δ' (Al₃Li) phase on pre-existing Al₃Sc precipitates at low temperature aging in the area of existence of Al₃Li phase, and form uniform shell around them. The motive force of such heterostructure formation is the minimization of total surface, elastic and chemical energy of the alloy. Dark-field transmission electron microscopy images of such composite particles taken from superlattice reflex 100 are composed of a dark core surrounded by a bright shell. The mutual diffusion of Li and Sc during the aging of Al-Li-Sc alloys is observed. The dark-field transmission electron microscopy image of the composite particle obtained from superlattice reflection became transparent after continuous natural aging of Al-Li-Sc alloys. The presence of the particle in Al matrix can be only seen due to decoration by secondary precipitations of δ' (Al₃Li) phase. Composition analysis of such transparent particles was carried out using two-beam kinematical theory of electron diffraction. Such composite particles with transparent cores remain in Al matrix even after severe plastic deformation of Al-Li-Sc alloy.
Keywords
EN
Publisher

Year
Volume
128
Issue
4
Pages
564-569
Physical description
Dates
published
2015-10
Contributors
author
  • Institute for Metal Physics of the NAS of Ukraine, Vernadsky Blvd. 36, 03680, Kyiv, Ukraine
author
  • Institute for Metal Physics of the NAS of Ukraine, Vernadsky Blvd. 36, 03680, Kyiv, Ukraine
author
  • Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovskii Str. 3, 03680, Kyiv, Ukraine
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv128n423kz
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