Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1523332 | Materials Chemistry and Physics | 2012 | 6 Pages |
Aluminum alloy 2014 is used to obtain nanostructured powders via mechanical alloying. The evolution of the diffusion processes is observed by the development of defect structures and nanoprecipitates after 10 h of milling. The characterization includes analytical and high resolution transmission electron microscopy. Dislocations associated with different Al/Cu ratio affect the material. These defects act as nucleation sites where precipitates of the ɛAl2Cu3 hexagonal phase have been identified. Moiré fringes show the interference of {1 1 1}Al with {1 0 −1 0}εAl2Cu3 glide planes and locally small shifts of 1/3{1 1 1}Al and 1/3{1 0 −1 0}εAl2Cu3. Changes in the Al/Cu ratio lead to the formation of other solid solutions identified in the Cu rich area and could correspond to transition phases.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Development of defect structures and nanoprecipitates after 10 h of mechanical alloying in Al–Cu system. ► Defects act as nucleation sites of the ɛAl2Cu3 phase. ► Incoherent and semicoherent precipitates are identified by TEM–HRTEM. ► Moiré patterns are associated to the ɛAl2Cu3 phase.