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Konno, J; Kawasaki, M; Hiraga, K
Journal of Electron Microscopy, 01/2001, Volume: 50, Issue: 2Journal Article
We report atomic resolution imaging of Cu-planar precipitates in aged Al-Cu alloys, known as Guinier-Preston (GP) zones, by high-angle annular detector dark-field scanning transmission electron microscopy. Single layered GP-I zones as small as 2 nm in length were resolved among densely populated GP-I zones, whereas double layered GP zones were clearly identified. The images of GP-II zones showed not only the commonly accepted structure, in which single CU layers are separated by three Al layers, but also a variant, in which double Cu layers are separated by a single Al layer. Keywords:scanning transmission electron microscopy, HAADF-STEM, aged alloy, Guinier-Preston zone
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