کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10620430 988622 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Strain mapping of a triple junction in nanocrystalline Pd
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Strain mapping of a triple junction in nanocrystalline Pd
چکیده انگلیسی
Aberration-corrected transmission electron microscopy was used to provide structural information on a triple junction in nanocrystalline Pd. This triple junction consists of two intersecting Σ3 twin boundaries with a Σ9 grain boundary and is connected to a quadruple point via the Σ9 grain boundary. A comprehensive strain analysis of this triple junction using geometric phase analysis is presented and compared with a molecular dynamics simulation. The main results are: (i) the strain field of the core of the triple junction shows dislocation character and extends over a distance of about 0.5 nm; (ii) the intersecting boundaries result in a net translation of a02, which corresponds to a Burgers vector of an a02〈110〉 dislocation in the fcc lattice; (iii) a disclination emerging from the triple junction along the Σ9 grain boundary is balanced by a disclination of opposite sign emerging from the quadruple point. Based on the observation that the core of the triple junction can be described by the strain field of a dislocation, its energy was estimated using 12Gb2 to be about 1.7 × 10−9 J m−1. The presence of a disclination dipole is thought to be essential for stabilization of the structure observed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 59, Issue 19, November 2011, Pages 7380-7387
نویسندگان
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