HAADF-STEM study on the early stage of precipitation in aged Al-Ag alloys.
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.
Konno
Toyohiko J
TJ
Okunishi
Eiji
E
Ohsuna
Tetsu
T
Hiraga
Kenji
K
D000497:Alloys / Q000737:chemistry*; D000535:Aluminum / Q000737:chemistry*; D011232:Chemical Precipitation; D017348:Microscopy, Electron, Scanning Transmission; D046529:Microscopy, Electron, Transmission; D012834:Silver / Q000737:chemistry*
D000497:Alloys; D012834:Silver; D000535:Aluminum