2.5MeV的He~+离子辐照316L不锈钢中氦泡的形核与生长研究

Abstract

利用透射电子显微镜分析了０３—０５Ｔｍ温区（Ｔｍ为材料溶点）３１６Ｌ奥氏体不锈钢经高剂量氦离子辐照后辐照损伤峰区氦泡的形成行为实验结果支持氦泡的双原子形核模型，并证实氦泡的形成主要受制于自间隙子／氦置换机制扩散材料中高密度位错的存在显著增强氦泡形核并抑制氦泡生长与前人低剂量辐照实验结果的比较表明０３—０５Ｔｍ温区氦泡形核机制不随辐照剂量或剂量率发生显著变化．Specimens of 316L stainless steel are irradiated with 2.5 MeV He + ions at temperatures of 400,500 and 550℃,respectively.For each implantation the dose and dose rate are separately 2.5×10 21 ion/m 2 and (3 2—3 8)×10 16 ion/m 2s -1 .Bubble structures are investigated with cross sectional transmission electron microscopy(XTEM).The measured apparent activation energies provide evidence that the formation of bubbles is controlled by He diffusion via the self interstitial/He ...国家自然科学基金,国家高技术研究发展计划资