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TEM Characterization of Helium Bubbles in T91 and MNHS Steels Implanted with 200 keV He Ions at Different Temperatures

王霁  高星  王志光  魏孔芳  姚存峰  崔明焕  孙建荣  李炳生  庞立龙  朱亚滨  骆鹏  常海龙  张宏鹏  朱卉平  王栋  杜洋洋  谢二庆  
【摘要】:Modified novel high silicon steel(MNHS,a newly developed reduced-activation martensitic alloy) and commercial alloy T91 are implanted with 200 keV He~(2+) ions to a dose of 5 × 10~(20) ions/m~2 at 300,450 and 550℃.Transmission electron microscopy(TEM) is used to characterize the size and morphology of He bubbles.With the increase of the implantation temperature,TRM observations indicate that bubbles increase in size and the proportion ofbrick shaped cuboid bubbles increases while the proportion of polyhedral bubbles decreases in both the steel samples.For the samples implanted at the same temperature,the average size of He bubbles in MNHS is smaller than that in T91.This might be due to the abundance of boundaries and precipitates in MNHS,which provide additional sites for the trapping of He atoms,thus reduce the susceptibility of MNHS to He embrittlement.
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