کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1446559 988615 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Silver segregation to θ′ (Al2Cu)–Al interfaces in Al–Cu–Ag alloys
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Silver segregation to θ′ (Al2Cu)–Al interfaces in Al–Cu–Ag alloys
چکیده انگلیسی

θ′ (Al2Cu) precipitates in Al–Cu–Ag alloys were examined using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The precipitates nucleated on dislocation loops on which assemblies of γ′ (AlAg2) precipitates were present. These dislocation loops were enriched in silver prior to θ′ precipitation. Coherent, planar interfaces between the aluminium matrix and θ′ precipitates were decorated by a layer of silver two atomic layers in thickness. It is proposed that this layer lowers the chemical component of the Al–θ′ interfacial energy. The lateral growth of the θ′ precipitates was accompanied by the extension of this silver bilayer, resulting in the loss of silver from neighbouring γ′ precipitates and contributing to the deterioration of the γ′ precipitate assemblies.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 60, Issue 17, October 2012, Pages 6033–6041
نویسندگان
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