کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7968939 1514345 2018 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Indentation size effect in tungsten: Quantification of geometrically necessary dislocations underneath the indentations using HR-EBSD
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Indentation size effect in tungsten: Quantification of geometrically necessary dislocations underneath the indentations using HR-EBSD
چکیده انگلیسی
During indentation testing of the low defect density crystalline materials, higher hardness values are found at lower indentation depths, which is referred to as an indentation size effect. The depth-dependence of hardness can be described by the Nix-Gao model, which is based on the concept of Geometrically Necessary Dislocations (GNDs). The underlying dislocation mechanism remains, however, unclear and requires independent measurement of GND density below the indentation. In the present work, the depth-dependency of the GND density is quantified underneath the Berkovich indentations in tungsten via high-resolution electron backscatter diffraction. There a higher GND density is found for lower indentation depths, resulting in a higher Taylor hardness for measured GND density.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 142, August 2018, Pages 39-42
نویسندگان
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