| Numéro |
J. Phys. Colloques
Volume 48, Numéro C3, Septembre 1987
4th International Aluminium Lithium Conference
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|---|---|---|
| Page(s) | C3-481 - C3-488 | |
| DOI | https://doi.org/10.1051/jphyscol:1987355 | |
4th International Aluminium Lithium Conference
J. Phys. Colloques 48 (1987) C3-481-C3-488
DOI: 10.1051/jphyscol:1987355
Reynolds Metals Company, Metallurgy Laboratory, Richmond, VA 23219, U.S.A.
J. Phys. Colloques 48 (1987) C3-481-C3-488
DOI: 10.1051/jphyscol:1987355
THE ICOSAHEDRAL Al-Li-Cu PHASE
F.W. GAYLEReynolds Metals Company, Metallurgy Laboratory, Richmond, VA 23219, U.S.A.
Abstract
The common grain boundary precipitate in commercial Al-Li-Cu-(Mg) alloys which is responsible for detrimental precipitate-free zones is the icosahedral Al-Li-Cu phase designated T2. The present work discusses the growth of the T2 phase as large, faceted single quasicrystals and reviews results of morphological analyses and high resolution x-ray studies. These results confirm the icosahedral point symmetry of the phase and allow comment on the atomic structure and the disorder which appears to be inherent in the phase.