کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1446395 988609 2013 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Shear transformation zone dynamics model for metallic glasses incorporating free volume as a state variable
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Shear transformation zone dynamics model for metallic glasses incorporating free volume as a state variable
چکیده انگلیسی

A mesoscale model, shear transformation zone dynamics (STZ dynamics), is employed to investigate the connections between the structure and deformation of metallic glasses. The present STZ dynamics model is adapted to incorporate a structure-related state variable, and evolves via two competing processes: STZ activation, which creates free volume, vs. diffusive rearrangement, which annihilates it. The dynamical competition between these two processes gives rise to an equilibrium excess free volume that can be connected to flow viscosity via the phenomenological Vogel–Fulcher–Tammann relation in relaxed structures near the glass transition temperature. On the other hand, the excess free volume allows glasses to deform at low temperatures via shear localization into shear bands, even in the presence of internal stress distributions that arise upon cooling after processing.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 61, Issue 9, May 2013, Pages 3347–3359
نویسندگان
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