کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
789294 1465716 2005 18 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Size, geometry and nonuniformity effects of surface-nanocrystalline aluminum in nanoindentation test
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Size, geometry and nonuniformity effects of surface-nanocrystalline aluminum in nanoindentation test
چکیده انگلیسی

In the present research, the mechanical behavior of the surface-nanocrystalline aluminum (SNCA) is investigated through nanoindentation experiment and theoretical modeling. Firstly, through microscopical observation and measurement for the SNCA material, a microstructure cell model is developed. Secondly, based on the microstructure cell model and the strain gradient plasticity theory, and based on introducing a parameter accounting for the grain size nonuniformity effect, the discrete features of the hardness–depth relations of the SNCA material are described. The “U-type” feature of the hardness–depth experimental curves is modeled and simulated. Thirdly, in the SNCA material the mechanical property of the grain boundary, i.e., the strength of plastic zone penetrating the grain boundary is characterized by introducing a criterion parameter, the critical effective plastic strain. The “waterfall-type” feature of the hardness–depth curves is modeled and simulated. It is worth pointing out that, in the present study, the length scale parameter in the strain gradient plasticity theory is taken as a universal material parameter instead of a simulation parameter, and it is determined through applying the strain gradient plasticity theory to the modeling of the corresponding single crystal aluminum.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Plasticity - Volume 21, Issue 11, November 2005, Pages 2089–2106
نویسندگان
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