کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1445626 1509595 2014 19 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Orientation-dependent indentation response of magnesium single crystals: Modeling and experiments
ترجمه فارسی عنوان
پاسخ دندانه ای وابسته به جهت گیری منیزیم تک کریستال: مدل سازی و آزمایش
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

We investigate the orientation-dependent characteristics of magnesium single crystals under localized contact using nanoindentation experiments and crystal plasticity finite element (CPFE) simulations. Nanoindentation experiments on (0 0 0 1) and (112¯0) planes exhibited distinct load–depth responses. Atomic force microscopy revealed material pile-up with sixfold symmetry in the former case and a sink-in phenomenon with twofold symmetry in the latter case. Our corresponding detailed CPFE simulations uncover the evolution of deformation activity in the indented volume, thereby providing insight into the interacting effects that cause the pile-up and sink-in phenomena. The simulations indicate the occurrence of {101¯2} extension twins in both cases, although their spatial locations are different. These observations strongly corroborate with our transmission electron microscopic analysis of the indented samples. Finally, our simulations also indicate that, depending upon the crystal orientation, elastic recovery upon unloading may play important role in final surface morphology around the indented region.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 81, December 2014, Pages 358–376
نویسندگان
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