在美国Argonne国家实验室连接有IVEM-Tandem National Facility加速器的Hitatch3000电子显微镜上,通过能量600keV及注量率为2.5×10¹²cm^-2*s^-1的Ne离子原位辐照,研究了锆-4合金中沉淀相hcp-Zr(Cr,Fe)2的重离子辐照效应,结果表明:600keV的Ne离子在350℃原位辐照至0.2dpa时,hcp-Zr(Cr,Fe)₂沉淀相的层错条纹开始消失;0.8dpa时沉淀相的电子衍射斑点大部分消失,发生明显的化学无序;2.7dpa时明场像衬度完全消失,非晶环已非常明显,表明沉淀相已经非晶化.600keV的Ne离子在350℃辐照hcp-Zr(Cr,Fe)₂相非晶化的临界损伤离位率约为2.7dpa.

The 600 keV Ne⁺ ion irradiation and in-situ TEM observation were performed in a Zircaloy 4 using the HVEM-Tandem Facility at 350°C, and the ion flux was 2.5×10¹² cm^-2·s^-1. The structural damage upon irradiation was monitored by the selected area electron diffraction patterns (SAED) under in-situ TEM observations. The amorphization transformation was determined by the disappearance of all diffraction maxima in the SAED patterns and microstructural contrast. The results show that in situ 600 keV Ne⁺ irradiation at 350°C, stacking fault contrast starts fading up to 0.2 dpa, and disappears basically up to 0.4 dpa, and the disorder of Zr(Cr, Fe)₂ precipitate happens at the same time. The Zr(Cr, Fe)₂ precipitate becomes amorphous at a dose of about 2.7 dpa.