Physics – Condensed Matter – Materials Science
Scientific paper
2012-01-05
Julian M. Rosalie, Laure Bourgeois and Barrington C. Muddle, Acta Materialia, 59(19),pp 7168-7176 (2011)
Physics
Condensed Matter
Materials Science
Pre-print. 16 pages, 8 figures
Scientific paper
10.1016/j.actamat.2011.08.001
Precipitation of the \gamma' (AlAg2) phase was investigated in Al-Ag(-Cu) alloys using high resolution transmission electron microscopy and scanning transmission electron microscopy. Precipitation commenced with segregation of silver to stacking faults, followed by thickening in steps corresponding to single unit cell ledges. In conjunction with gradual segregation of silver and aluminium into ordered layers this yielded \gamma' phase platelets with a thickness of either 2 or 3x the AlAg2 c-lattice parameter. Plates with a thickness of 2 c(AlAg2) would not achieve self-accommodation of the shape strain for transformation. Further thickening of the precipitates was slow, despite considerable silver segregation around the precipitates. Growth by the addition of single unit cell height ledges is expected to lead to an additional shear strain energy barrier to ledge nucleation and this may contribute to a process of nucleation-limited growth.
Bourgeois Laure
Muddle Barrington C.
Rosalie Julian M.
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