کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1450176 988725 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Micromechanisms of serrated flow in a Ni50Pd30P20 bulk metallic glass with a large compression plasticity
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Micromechanisms of serrated flow in a Ni50Pd30P20 bulk metallic glass with a large compression plasticity
چکیده انگلیسی

Serrated flow is a characteristic feature of plastic deformation of bulk metallic glasses (BMGs) with a large compression strain. However, the underlying mechanisms of the discrete plasticity in the disordered solids have been debated for many years. Here, we report mechanical behavior and microstructural evolution of a Ni50Pd30P20 BMG subjected to uniaxial compression testing. Extensive nanocrystallization within shear bands and in the vicinity of fracture surfaces was observed and various crystal defects, including dislocations, twins and kink bands, were detected in the resultant nanocrystals. These observations suggest a microscopic mechanism of the serrated flow of the BMG, i.e. the stress drop is caused by local strain-softening and the arrest of shear bands is associated with in situ nanocrystallization.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 56, Issue 12, July 2008, Pages 2834–2842
نویسندگان
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