三维原子探针对Ni_4Mo合金的研究

Study on Ni_4Mo Alloy by Three Dimensional Atom Probe

用带场离子显微镜(FIM)功能的三维原子探针(3DAP)对Ni4Mo有序合金进行研究,并测试脉冲分数对试验结果的影响。观察到Ni4Mo有序合金中存在反相畴界。当脉冲分数为20%时,3DAP能比较准确地对纳米空间中的Ni元素和Mo元素进行定量分析,并能给出空间位置分辨率较高的三维分布图形。当脉冲分数小于20%时,脉冲分数越低,3DAP测得的结果与真实成分的偏差越大。脉冲分数对元素同位素丰度和元素电离价态的测量结果没有影响。

Three dimensional atom probe （3DAP） with field ion microscope （FIM） was used to investigate Ni4Mo ordered alloy and the effect of pulse fraction on the experimental results obtained from 3DAP was studied. Antiphase boundary was observed in the alloy by FIM. An accurate chemical composition of Ni and Mo within a nano-space and a three dimensional atom position map with higher resolution were obtained at 20% pulse fraction. However, with the pulse fraction below 20%, the disparity between measured composition and academic composition grew larger as descending of the pulse fraction. No effect of pulse fraction was found on isotopic ratio and ionized electrovalence measuring.