کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5435944 1509538 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Linking macroscopic rejuvenation to nano-elastic fluctuations in a metallic glass
ترجمه فارسی عنوان
پیوند نوآوری ماکروسکوپی به نوسانات نانو الاستیک در یک شیشه فلزی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

Metallic glasses are structurally heterogeneous below a certain length scale. Here we demonstrate how elastic heterogeneities change in response to a macroscopic cyclic, but elastic, loading protocol. Fluctuations in local elastic properties are spatially resolved across the surface of a bulk sample by evaluating nano-scale contact resonances of an atomic force microscope. The findings indicate a significant increase in nano-elastic fluctuations due to loading. The distribution of these fluctuations broadens symmetrically and almost three fold, revealing how the atomically disordered structure is driven further out of equilibrium at the nano-scale. Macroscopically, the stress-driven elastic heterogeneities lead to a rejuvenation and therefore a new structural state of the bulk metallic glass, characterized by a higher energy release during heating and mechanical softening. These results show how macroscopic energy storage in metallic glasses may be linked to the development of nano-scale elastic fluctuations.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 138, 1 October 2017, Pages 111-118
نویسندگان
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