کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1566761 999825 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Plastic deformation in zirconium nitride observed by nanoindentation and TEM
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
Plastic deformation in zirconium nitride observed by nanoindentation and TEM
چکیده انگلیسی

A study on zirconium nitride using TEM and nanoindentation was performed to assess the significant surface plasticity found to be introduced by sample polishing. Cross-sectional TEM results show strong evidence of plasticity via dislocations produced directly from surface grinding and polishing. These dislocations were found to glide on the {011}〈01¯1〉 slip system. Using nanoindentation to observe the effects of surface dislocation density, a critical shear stress was found that relates to dislocations nucleation and multiplication. Continued chemo-mechanical polishing increased the critical shear stress to approximately 1600 mN by reducing surface dislocations. It is postulated that vacancy clusters and oxide microcrystallites produced during surface processing provide dislocation nucleation and/or multiplication sites. Gentle chemo-mechanical polishing for several hours greatly reduced or eliminated preexisting dislocations such that the critical shear stress for nucleation approaches the theoretical limit (∼G/5).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 416, Issue 3, 30 September 2011, Pages 253–261
نویسندگان
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