Mechanical properties of low energy He irradiated 304SS have been investigated by means of tensile test and nano-identation hardness tests. Specimen size is 2.8 mm × 5.4 mm × 0.1 mm in gauge and 12.4 mm in total length. Specimens are irradiated with 8 keV helium ions at R.T., 573 K and 873 K up to the fluence of 3 × 1021 He/m2. Tensile tests are performed on unirradiated and irradiated specimens at a strain rate of 3.33 × 10-3 s-1. In every irradiation condition, one specimen is tested to failure and the other two specimens are strained plastically to 10% and 20%. Formation of blisters with a diameter of about 500 nm is observed on the surface of tensile-tested specimens after R.T. irradiation. Some exfoliation of the blisters is also observed. When the irradiation temperature increases, a large number of cracks with a size of about several micrometers are formed on the surface together with exfoliation during the tensile test. The yield stress of specimens irradiated at R.T. and 573 K increases about 10% in comparison with that of the unirradiated specimen. The result of nano-indentation tests indicate that hardness near the surface increases depending on the irradiation temperature.
|ジャーナル||Fusion Engineering and Design|
|出版ステータス||出版済み - 2 2006|
|イベント||Proceedings of the Seventh International Symposium on Fusion Nuclear Technology ISFNT-7 Part A - |
継続期間: 5 22 2005 → 5 27 2005
All Science Journal Classification (ASJC) codes