2.5MeV的He^+离子辐照316L不锈钢中氦泡的形核与生长研究  

THE FORMATION OF HELIUM BUBBLES IN 316L STAINLESS STEEL IRRADIATED WITH 2.5 MeV He + IONS

作　　者：张崇宏[1] 陈克勤[1] 王引书[1] 孙继光[2] 

机构地区：[1]中国科学院近代物理研究所 [2]北京有色金属研究总院

出　　处：《物理学报》1997年第9期1774-1781,共8页Acta Physica Sinica

基　　金：国家自然科学基金;国家高技术研究发展计划资助

摘　　要：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 replacement mechanism.Good agreement is found between our results and other low dose experimental data,indicating that the underlying mechanism holds constant for different implantation conditions.The pre implantation cold working enhances significantly the nucleation of bubbles,and the dislocations are favorable sites for bubble nucleation in the investigated temperature range.

关 键 词：形核 氦泡 不锈钢 离子辐照 脆性 氦离子 氦脆 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG111.91[金属学及工艺—金属材料]