Radiation induced microstructures in ODS 316 austenitic steel under dual-beam ions
Radiation induced microstructures in ODS 316 austenitic steel under dual-beam ions
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DOI：
10.1016/j.jnucmat.2014.06.024
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发表时间：
2014-12
影响因子：
3.1
通讯作者：
H. Zhang;Z. Yao;Zhangjian Zhou;Man Wang;O. Kaitasov;M. Daymond
中科院分区：
文献类型：
--
作者：
H. Zhang;Z. Yao;Zhangjian Zhou;Man Wang;O. Kaitasov;M. Daymond
采用1 MeV Kr+和15 keV He+双离子束对ODS 316奥氏体钢进行辐照，并进行了透射电镜原位观察。在低剂量下，同时注入氦气辐照样品形成空洞。结果表明，在低剂量下，Y-Ti-O粒子对空洞的形成起着强陷阱的作用。氦对空洞的形成有显著影响。空洞也优先沿沿着晶界、相界和孪晶界形核。辐照诱导的晶格缺陷主要由1/2<1 1 0>完全环和1/3<1 1 1>弗兰克环组成。氦注入速率的增加也大大促进了Frank环的生长。发现小的（<10 nm）Y-Ti-O颗粒在高剂量辐照后不稳定。辐照后观察到M23 C6沉淀，氦可能在其形成中起主要作用。
An ODS 316 austenitic steel was fabricated and irradiated using dual ion beams (1 MeV Kr+and 15 keV He+) with in-situ transmission electron microscope (TEM) observation. Cavities formed at a low dose in samples irradiated with simultaneous helium injection. It was found that Y–Ti–O particles acted as strong traps for cavity formation at low doses. Helium exhibited a significant effect on cavity development. Cavities were also preferentially nucleated along grain boundaries, phase boundaries and twin boundaries. Irradiation induced lattice defects mainly consisted of small 1/2<1 1 0> perfect loops and 1/3<1 1 1> Frank loops. An increment of helium injection rate also greatly enhanced the Frank loop growth. Small (<10 nm) Y–Ti–O particles were found to be unstable after irradiation to high doses. M23C6precipitates were observed after irradiation and helium might play a major role in their formation.