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

• Authors: O. Molebnyi , A. Berezina , A. Kotko
• Languages of publication: 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

64.70.dg; 81.07.Bc; 81.10.Fg

Discipline

• 64.70.dg: Crystallization of specific substances
• 81.07.Bc: Nanocrystalline materials

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 128
• Issue: 4
• Pages: 564-569

Dates

published

2015-10

Contributors

author

O. Molebnyi

• Institute for Metal Physics of the NAS of Ukraine, Vernadsky Blvd. 36, 03680, Kyiv, Ukraine

author

A. Berezina

• Institute for Metal Physics of the NAS of Ukraine, Vernadsky Blvd. 36, 03680, Kyiv, Ukraine

author

A. Kotko

• Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovskii Str. 3, 03680, Kyiv, Ukraine

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Identifiers

DOI

10.12693/APhysPolA.128.564