کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7981031 1514732 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of dislocation density on improved radiation hardening resistance of nano-structured tungsten-rhenium
ترجمه فارسی عنوان
اثر تراکم جابجایی در بهبود مقاومت به تشدید تابش تنگستن رنیوم نانو ساختار یافته
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
چکیده انگلیسی
Rolled tungsten 5 wt% rhenium sheet has been annealed to produce two microstructures. As received with a high dislocation density, measured using HR-EBSD, and pancake shaped grains with a thickness of ≈200 nm and annealed with equiaxed grains with average grain size of ≈90 µm and low dislocation density. Both materials were ion implanted with 2 MeV W+ ions to damage levels of 0.07, 0.4, 1.2 and 13 displacements per atom (dpa). Nanoindentation was used to measure change in hardness after implantations. While irradiation induced hardening is seen to saturate in the as received material at an increase of 0.4 GPa at 0.4 dpa, the relative hardness change is over four time higher in the annealed material (1.3 GPa) and saturation does not occur by 13 dpa. These differences in radiation response are due to the increased sinks for damage in the as received microstructure in the form of dislocation networks. This is advantageous for use of such nanostructured tungsten sheet in composite materials for structural applications as they will have improved radiation resistance as compared to bulk tungsten products. As well as showing the danger of using idealized microstructures for radiation damage studies.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 611, 12 August 2014, Pages 388-393
نویسندگان
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