碳离子辐照对纯钨组织结构及表面硬度的影响

Effects of Carbon Ion Irradiation on Microstructure and Surface Hardness of Pure Tungsten

采用扫描电子显微镜、透射电子显微镜及纳米压痕仪研究了700℃下碳离子辐照对钨的表面形貌、组织结构和表面硬度的影响。结果表明,碳离子辐照会导致样品表面出现辐照蚀坑,且随着辐照剂量的增加,辐照蚀坑尺寸变大。碳离子辐照在样品内部产生了大量位错环,且随辐照剂量增加,位错环数密度和尺寸均增大。碳离子辐照使钨表面发生严重的辐照硬化效应,样品表面硬度随辐照剂量增加明显增大。当辐照剂量达到8.0dpa时,钨表面平均硬度达到15.85GPa。辐照产生的位错环是辐照硬化的主要原因。

The effects of carbon ion irradiation at 7oo C on the surface morphology,microstructure and surface hardness of pure tungsten were studied by scanning electron microscopy,transmission electron microscopy and nanoindenter.The results show that carbon ion irradiation can lead to irradiated pits on the surface of the samples,and the size of the pits increases with the increase of irradiation dose.Carbon ion irradiation produces a large number of dislocation loops inside the sample,and the size and number density of the loops increase with the increase of radiation dose.Also,carbon ion irradiation causes a severe irradiation hardening effect on the tungsten surface,and the surface hardness of the samples increases significantly with the increases of irradiation dose.The average hardness of the tungsten surface reaches 15.85 GPa when the irradiation dose reaches 8.0 dpa.The dislocation loops generated by irradiation are the main cause of the irradiation hardening.