双束同时辐照对低活性Fe-Cr-Mn(W,V)合金相稳定性影响

Effect of dual-beam irradiation on the phase stability in low activation Fe-Cr-Mn alloys

采用电子束 /He+ ion束同时复合辐照方式 ,研究了低活性Fe Cr Mn(W ,V)合金高温长时时效后组织稳定性 ,评价了He对辐照相稳定性影响。结果表明 ,单独电子辐照 ( 10a-1 )只引起相界面低密度空洞形成。而双束同时辐照对组织损伤具有协同效果 ,加剧相稳定性发生变化 ,如 :促进相间溶质原子扩散 ,导致析出相长大 ;新相的形成 ;发生结构无序化 ,促进析出相改性。从He原子与晶体辐照点缺陷与溶质原子相互作用和扩散等机制 ,讨论了辐照相稳定性发生变化的原因。

In order to investigate the effects of helium on t he phase stability and micro structural evolution in aged Fe-Cr-Mn alloy durin g modes of electron beam and electron/ He +-ion dual-beam, in-site obser vation were carried out using a high voltage electron microscope connected with an ion accelerator,the effect of helium on the phases stability is appraised. E xperimental results show that the low density of void were formed on the phase b oundaries by electron irradiation only. The damage structure had synergistic eff ect during electron/ He +-ion dual-beam irradiation. The change of phase stability were quickened. Example: radiation induced precipitate was grown due t o diffusion of solute atom, new phase were formed which not formed in aging trea tment alloys. The atomic mixing and the radiation disordering promote the modifi cation of precipitated phases. The effect of interaction between helium and poin t defects and solute atom, and the change reason of phase stability were discuss ed.