| Abstract |
| The matrix part of aged STS304 has been irradiated up to 5.4 dpa at 673 K using 1,250 keV highvoltage electron-microscopy (HVEM) connected with an ion accelerator, to study the effect of He pre-injection on microstructural evolution. Two types of irradiation modes were used in this study. The first mode used single electron-beam irradiation and the second mode used electron-beam irradiation after He pre-injection. Thin-disc samples were prepared from the matrix part of STS304 aged at 673 K for 1,000 h. Irradiationinduced- segregation analyses were carried out by an energy-dispersive X-ray analyzer (EDX) in a 200 keV field- emission transmission electron microscopy (FE-TEM) with a beam diameter of about 0.5 nm. The mean size of voids increased considerably and their distribution was bi-modal, when the electron-beam was used after He-injection. Void-number density, sink strength and swelling percentage of samples subjected to electron-beam irradiation after He-injection were larger than those subjected to single electron-beam irradiation. Compared to single electron-beam irradiation, the amount of grain boundary segregation was suppressed for electron-beam irradiation after He-injection. †(Received October 29, 2013) |
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| Key Words |
| alloys, aging, He pre-injection, radiation, transmission electron microscopy, TEM |
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