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Quasicrystalline grain boundary precipitates in aluminium alloys through solid‐solid transformations
Author(s) -
Cassada W. A.,
Shiflet G. J.,
Poon S. J.
Publication year - 1987
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1987.tb01354.x
Subject(s) - icosahedral symmetry , materials science , quasicrystal , grain boundary , annealing (glass) , aluminium , crystallite , crystallography , solid solution , metallurgy , alloy , phase (matter) , microstructure , chemistry , organic chemistry
SUMMARY We have observed the formation of icosahedral quasicrystals of Al‐Mg‐Zn, Al‐Mg‐Cu, Al‐Li‐Zn and Al‐Li‐Cu by low temperature annealing of solid solution alloys. The icosahedral phase particles form at the grain boundaries of the matrix alloys. The orientational relationships between the icosahedral crystallites, their corresponding Frank‐Kaspar phase particles and the aluminium matrix are reported. The stability of the icosahedral phases is also discussed. Finally, the importance of grain boundary icosahedral phase particles to the physical properties of commercial aluminium alloys is pointed out.