کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1562443 999587 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of pores on shear bands in metallic glasses: A molecular dynamics study
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مکانیک محاسباتی
پیش نمایش صفحه اول مقاله
Effects of pores on shear bands in metallic glasses: A molecular dynamics study
چکیده انگلیسی

The effects of nanoscale pores on the strength and ductility of porous Cu46Zr54 metallic glasses during nanoindentation and uniaxial compression tests are modelled and investigated using molecular dynamics (MD) simulations. In the MD simulations, atomistic amorphous samples were digitally prepared through fast quenching from the liquid states of copper and zirconium alloy. In both of the nanoindentation and uniaxial compression simulations, shear transformation zones and shear bands are observed through the local deviatoric shear strains in the samples. The results show that the existence of pores causes strain concentrations and greatly promotes the initialization and propagation of shear bands. Importantly, only pores reaching critical size can effectively facilitate the formation of multiple shear bands. It is also observed that hardening occurs through pore annihilation and the shear band stops in porous metallic glasses.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational Materials Science - Volume 50, Issue 1, November 2010, Pages 211–217
نویسندگان
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