کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1661795 1008431 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nanoindentation study of amorphous-Co79Zr13Nb8/Cr multilayers
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Nanoindentation study of amorphous-Co79Zr13Nb8/Cr multilayers
چکیده انگلیسی

The mechanical properties of Co79Zr13Nb8/Cr multilayers were investigated using nanoindentation. The hardness is higher than the average value calculated by rule-of-mixture. The hardness and the resistance to plastic deformation characterized by the ratio of H3/E2 vary similarly with periodicity (Λ). They all arrive to the maximum at Λ = 8 nm and decrease subsequently when the Λ increases. The hardness dependence on the Λ is fitted by Hall–Petch relation. The fitted index n is much lower than the normal value (~ 0.5) in many crystalline multilayers. The mutual restriction of shear band and dislocation in amorphous/crystalline structure, which is named structure barrier strengthening, should be main mechanism for the hardness enhancement. The SEM study of indents shows that the shear bands are distorted significantly at the smaller Λ (4 nm) and disappear at the larger Λ (> 20 nm). This morphology variation implies a potential improvement of plasticity caused by the restriction effect of the Cr crystalline layers on the shear bands propagation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface and Coatings Technology - Volume 202, Issue 14, 15 April 2008, Pages 3239–3245
نویسندگان
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