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Precipitation in a Nanograined 7475 Aluminium Alloy—Processing, Properties and Nanoanalysis
Author(s) -
Lewandowska Malgorzata,
Wawer Kinga,
Kozikowski Pawel,
Ohnuma Masato,
Kurzydlowski Krzysztof J.
Publication year - 2014
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201400018
Subject(s) - materials science , precipitation , metallurgy , alloy , grain boundary , severe plastic deformation , indentation hardness , precipitation hardening , aluminium , grain boundary strengthening , dislocation , extrusion , grain size , microstructure , composite material , physics , meteorology
The precipitation phenomena in 7475 nanograined aluminium alloy was analysed by means of microhardness measurements, small angle X‐ray scattering and electron microscopy. The nanograined samples were obtained by the hydrostatic extrusion of solution annealed and water quenched samples. It has been established that low temperature ageing causes precipitation processes to occur. However, the precipitation phenomena in nanograined materials proceed differently to those in micrograined materials. Moreover, the particle strengthening is limited by enhanced grain boundary precipitation which does not contribute to an increase in strength (when dislocation slip is the dominant deformation mechanism) and by the smaller size of precipitates.