کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1448843 988685 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Damping capacity of nanotwinned copper
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Damping capacity of nanotwinned copper
چکیده انگلیسی

Copper with different twin densities was obtained by its deposition from the vapour phase in the form of coatings or separated condensates (foils) on substrates kept at different temperatures. True values of the logarithmic decrement (LD) for copper were calculated from LD amplitude dependences, measured for the coating–substrate system in the range of coating deformation amplitudes 5 × 10−5 < ε < 10−3 at bending vibrations of 140–150 Hz of cantilever specimens. It is shown that with the reduction of the twin domain thickness to the nanosize range, the copper damping characteristics undergo a qualitative change, which is expressed in an abrupt weakening of the amplitude dependence of LD and in a considerable increase in LD values at its heating in the entire range of deformation amplitudes. The observed changes of the dissipative properties of copper are associated with the influence of twin boundaries on its microplastic deformation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 56, Issue 15, September 2008, Pages 3770–3776
نویسندگان
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