title: HAADF-STEM study on the early stage of precipitation in aged Al-Ag alloys.
abstract: We report on the structure of Ag precipitates in aged Al-Ag alloys using transmission electron microscopy and high-angle annular detector darkfield scanning transmission electron microscopy (HAADF-STEM). Irregularly shaped small Ag particles of 1-2 nm dominate the alloy annealed at 140 degrees C for 10 h. These particles are present also within large precipitates (10-50 nm), which are often characterized by their {100} and {110} facets. In addition, atomic-resolution HAADF-STEM images revealed that Ag atoms tend to form {111} planar clusters, which criss-cross a colony of the irregularly shaped small Ag precipitates.
authors.forename: Toyohiko J
authors.initials: TJ
authors.lastname: Konno
authors.forename: Eiji
authors.initials: E
authors.lastname: Okunishi
authors.forename: Tetsu
authors.initials: T
authors.lastname: Ohsuna
authors.forename: Kenji
authors.initials: K
authors.lastname: Hiraga
mesh_terms: D000497:Alloys / Q000737:chemistry*; D000535:Aluminum / Q000737:chemistry*; D011232:Chemical Precipitation; D017348:Microscopy, Electron, Scanning Transmission; D046529:Microscopy, Electron, Transmission; D012834:Silver / Q000737:chemistry*
chemical_list: D000497:Alloys; D012834:Silver; D000535:Aluminum