Irradiation-induced hardening mechanism of ion irradiated JLF-1 to high fluences
Irradiation-induced hardening mechanism of ion irradiated JLF-1 to high fluences
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DOI：
10.1016/j.fusengdes.2005.09.063
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发表时间：
2006-02
影响因子：
1.7
通讯作者：
H. Ogiwara;A. Kohyama;H. Tanigawa;H. Sakasegawa
中科院分区：
文献类型：
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作者：
H. Ogiwara;A. Kohyama;H. Tanigawa;H. Sakasegawa
低活化铁素体/马氏体钢（RAF）是聚变堆包层和第一壁的主要候选材料，位移损伤和氦产生对材料力学性能和微观结构的影响是重要的研究课题。本工作的目的是通过离子辐照和纳米压痕来阐明辐射硬化机制。JLF-1（9 Cr-2 W-V，Ta）钢在693、743和793 K进行了60 dpa的辐照试验。用6.4MeV的Fe ~（3+）进行单离子辐照。同时对Fe ~（3+）离子和能量退化的1.0MeV He ~+离子进行双离子辐照。位移损伤率和氦注入率分别达到1.0×10−3dpa/s和1.5×10− 2appmHe/s。作为辐照后检查，进行了透射电子显微镜（TEM）观察和纳米压痕测量。这些照射温度之间的显微硬度的微小差异进行了测量下单离子辐照。在743 K下，单离子辐照形成了辐射诱导沉淀（RIP），但RIP对辐射硬化的贡献估计小于位错环。双离子辐照下693 K组织演化的氦效应比单离子辐照下的缺陷团更细小，且双离子辐照下693 K辐照试样的辐照硬化有较大的增加。
Reduced-activation ferritic/martensitic steels, RAFs, are leading candidates for blanket and first wall of fusion reactors, and effects of displacement damage and helium production on mechanical properties and microstructures are important subjects. The objective of this work is to clarify radiation hardening mechanism by means of ion irradiation and nano indentation. JLF-1 (9Cr–2W–V, Ta) steel was irradiated to 60dpa at 693, 743 and 793K. Single-ion irradiation was performed with 6.4MeV Fe3+. The Fe3+ions and the energy-degraded 1.0MeV He+ions were simultaneously irradiated for dual-ion irradiations. The displacement damage rate and helium injection rate were up to 1.0×10−3dpa/s and 1.5×10−2appm He/s, respectively. As the post-irradiation examination, transmission electron microscopy (TEM) observations and nano-indentation measurements were carried out. Small differences in micro-hardness between these irradiation temperatures were measured under single-ion irradiation. Radiation-induced precipitate (RIP) was formed at 743K under single-ion irradiation, but the contribution of RIP to radiation hardening was estimated smaller than that of dislocation loops. Helium effect of microstructural evolution at 693K under dual-ion irradiation was found to contain a finer defect clusters than that under single-ion irradiation, and a large increment of irradiation hardening was measured in the specimen irradiated at 693K under dual-ion irradiations.