کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1625220 1516426 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Elastic–plastic transition during nanoindentation in bulk GaN crystal
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Elastic–plastic transition during nanoindentation in bulk GaN crystal
چکیده انگلیسی

Mechanical properties of a defect-free bulk GaN single crystal has been studied by nanoindentation in the C (0001) surface. Our experiments provide consistent evaluations of Young's modulus (E = 320 GPa) measured with both Berkovich and spherical indenters. Additionally, Berkovich hardness (H = 17 GPa) and true hardness (Ht = 25 GPa) were determined. Pop-in events are confirmed to indicate the elastic–plastic transition of the material, and give also consistent yield (maximum) shear stress, τmax = 19 GPa, for both the indenters. To achieve these precise analyses, the effective curvature of the indenter was determined by the Hertz analysis of the contact between the indenter and a diamond crystal, in addition to the Oliver–Pharr method with a standard fused quartz.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 450, Issues 1–2, 14 February 2008, Pages 405–411
نویسندگان
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