کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7897888 | 1510130 | 2018 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Damage microstructure evolution of helium ion irradiated SiC under fusion relevant temperatures
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
In-situ transmission electron microscopy (TEM) with ion irradiation has been used to study the damage microstructure evolution of He ion irradiated 4-H SiC at nuclear fusion relevant temperatures. The SiC samples were irradiated with 20â¯keV He ions at 25, 400, 800 and 1200â¯Â°C to a dose of 5.0 displacements per atom (DPA). At 25â¯Â°C, the material fully amorphises at 1.5 DPA and no He bubble nucleation occurs up to the doses studied. At 400 and 800â¯Â°C, He bubble nucleation occurs and the material remains crystalline. Bubble nucleation occurs at 2.0â¯DPA at 400â¯Â°C but occurs at only 0.5â¯DPA at 1200â¯Â°C. This is attributed the He atoms de-trapping from vacancies and migrating interstitially to larger He-vacancy clusters at higher temperatures, leading to faster nucleation of observable He bubbles. Helium platelets form at an irradiation temperature of 1200â¯Â°C at 0.5â¯DPA showing a preference for nucleation between the {0001} basal planes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 38, Issue 11, September 2018, Pages 3718-3726
Journal: Journal of the European Ceramic Society - Volume 38, Issue 11, September 2018, Pages 3718-3726
نویسندگان
R.W. Harrison, S. Ebert, J.A. Hinks, S.E. Donnelly,