کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9793719 | 1514277 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Defect structural evolution in high purity tungsten irradiated with electrons using high voltage electron microscope
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
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چکیده انگلیسی
Four types of high purity tungsten were irradiated with 2Â MeV electrons to 5Â dpa using a high voltage electron microscope, and defect structural evolutions were examined as a function of the irradiation temperature and the concentration of impurity atoms. Three of materials were made by sintering of tungsten powder with purity of 99.999% (5N-W), 99.99% (PF-W) and 99.95% (N-W), and one was a chemical vapor deposited tungsten of 99.9999% (CVD-W) purity. The formation of interstitial type dislocation loops is observed above room temperature by electron irradiation. In sintered tungsten, the number density of loops increases with increasing density of impurity atoms, i.e., N-WÂ >Â PF-WÂ >Â 5N-W. The density of loops in CVD-W is relatively high, contrary to its purity. In CVD-W, a heterogeneous formation of loops is observed at above 573Â K. Loops are aligned on layers, and no loops are formed between the layers. All four types of specimens have a change in slop of the temperature dependence of loop number density at around 500Â K which is caused by impurity atoms. Results of radioactivation analysis and hardness testing are also presented.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 343, Issues 1â3, 1 August 2005, Pages 308-312
Journal: Journal of Nuclear Materials - Volume 343, Issues 1â3, 1 August 2005, Pages 308-312
نویسندگان
S. Fukuzumi, T. Yoshiie, Y. Satoh, Q. Xu, H. Mori, M. Kawai,