R&D Sandvik Tooling, SE-126 80 Stockholm, Sweden.
Ultramicroscopy. 2011 May;111(6):609-14. doi: 10.1016/j.ultramic.2011.01.031. Epub 2011 Feb 2.
A specially produced Ti(C,N) standard material, with a known nominal composition, was investigated with laser assisted atom probe tomography. The occurrence of molecular ions and single/multiple events was found to be influenced by the laser pulse energy, and especially C related events were affected. Primarily two issues were considered when the composition of Ti(C,N) was determined. The first one is connected to detector efficiency, due to the detector dead-time. The second one is connected to peak overlap in the mass spectrum. A method is proposed for quantification of the C content in order to establish the C/N ratio. A correction was made to the major C peaks, C at 6 and 12 Da, with the (13)C isotopes, at 6.5 and 13 Da, according to the known natural abundance. In addition, a correction of the peak at 24 Da, where C and Ti overlap, is proposed based on the occurrence of single/multiple events for respective element. The results were compared to the results from other techniques such as electron energy loss spectroscopy, chemical analysis and X-ray diffraction. After applying the corrections, atom probe tomography results were satisfactory. Furthermore, the content of dissolved O in Ti(C,N) was successfully quantified.
采用激光辅助原子探针层析技术对一种特制的 Ti(C,N)标准材料进行了研究，该材料具有已知的名义成分。发现分子离子和单/多事件的出现受激光脉冲能量的影响，特别是 C 相关事件受到影响。在确定 Ti(C,N)的成分时，主要考虑了两个问题。第一个问题与探测器效率有关，因为探测器存在死区时间。第二个问题与质谱中的峰重叠有关。提出了一种定量 C 含量的方法，以建立 C/N 比。根据已知的自然丰度，对主要 C 峰（6 和 12 Da 的 C）和（13）C 同位素（6.5 和 13 Da 的 C）进行了修正。此外，根据各自元素的单/多事件的出现，提出了对 24 Da 处 C 和 Ti 重叠峰的修正，该峰处 C 和 Ti 重叠。将结果与电子能量损失光谱、化学分析和 X 射线衍射等其他技术的结果进行了比较。应用修正后，原子探针层析技术的结果令人满意。此外，还成功地定量了 Ti(C,N)中溶解氧的含量。
