摘要
为研究不同退火温度对钴发射体的显微组织和力学性能的影响,利用高纯钴粉进行了熔炼和热加工制备出自给能中子探测器用钴发射体,并采用电子背散射衍射(EBSD)技术对样品进行了表征。实验结果表明,在600~900℃,随退火温度上升钴发射体晶粒尺寸从2.69μm增加到19.79μm;FCC相随退火温度的升高晶粒取向随机,无明显的择优取向;且随温度的上升FCC相占比从29.7%下降到5.4%,而HCP相随退火温度的升高,随呈现出随机织构,但在600~800℃范围FCC相存在{110}〈111〉织构。钴发射体GND值随退火温度升高,变化范围为(0.37~0.81)×10^(14) m^(-2),抗拉强度、屈服强度和硬度呈现降低趋势,延伸率从3.2提高到8.7%。
To investigate the effects of different annealing temperatures on the microstructure and mechanical properties of cobalt emitter,high-purity cobalt powder was smelted and hot-processed to prepare cobalt emitter for self-powered neutron detectors.The samples were characterized using electron backscatter diffraction(EBSD)technology.Experimental results showed that as the annealing temperature increased from 600℃to 900℃,the grain size of the cobalt emitter increased from 2.69μm to 19.79μm.The FCC phase exhibited random grain orientations with no significant preferred orientation as the annealing temperature rose.With increasing temperature,the FCC phase proportion decreased from 29.7%to 5.4%,while the HCP phase showed random textures.Notably,the FCC phase retained a{110}〈111〉texture within the 600-800℃range.The geometrically necessary dislocation(GND)density of the cobalt emitters varied between(0.37-0.81)×10^(14) m^(-2) with increasing annealing temperature.Additionally,the tensile strength,yield strength,and hardness exhibited a decreasing trend,while the elongation improved from 3.2%to 8.7%.
作者
王焱辉
冯邻江
唐会毅
王云春
谢勇
周寻
严俐
谢雨辰
WANG Yanhui;FENG Linjiang;TANG Huiyi;WANG Yunchun;XIE Yong;ZHOU Xun;YAN Li;XIE Yuchen(Chongqing Materials Research Institute Co.,Ltd.,Chongqing 400707,China;National Engineering Research Center for Instrument Function Materials,Chongqing 400707,China)
出处
《功能材料》
北大核心
2025年第5期5167-5172,5191,共7页
Journal of Functional Materials
基金
国家重点研发计划课题项目(2023YFB3210002)。
关键词
钴发射体
自给能中子探测器
显微组织
织构
cobalt emitter
self-powered neutron detector
microstructure
texture
