通过皮秒脉冲激光原子探针断层扫描研究一种模型镍铝铬高温合金的现场蒸发行为。
On the field evaporation behavior of a model Ni-Al-Cr superalloy studied by picosecond pulsed-laser atom-probe tomography.
作者信息
Zhou Yang, Booth-Morrison Christopher, Seidman David N
机构信息
Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA.
出版信息
Microsc Microanal. 2008 Dec;14(6):571-80. doi: 10.1017/S1431927608080963.
The effects of varying the pulse energy of a picosecond laser used in the pulsed-laser atom-probe (PLAP) tomography of an as-quenched Ni-6.5 Al-9.5 Cr at.% alloy are assessed based on the quality of the mass spectra and the compositional accuracy of the technique. Compared to pulsed-voltage atom-probe tomography, PLAP tomography improves mass resolving power, decreases noise levels, and improves compositional accuracy. Experimental evidence suggests that Ni2+, Al2+, and Cr2+ ions are formed primarily by a thermally activated evaporation process, and not by post-ionization of the ions in the 1+ charge state. An analysis of the detected noise levels reveals that for properly chosen instrument parameters, there is no significant steady-state heating of the Ni-6.5 Al-9.5 Cr at.% tips during PLAP tomography.
基于质谱质量和该技术的成分分析精度，评估了用于快速凝固的Ni-6.5 Al-9.5 Cr（原子百分比）合金的脉冲激光原子探针（PLAP）断层扫描中皮秒激光脉冲能量变化的影响。与脉冲电压原子探针断层扫描相比，PLAP断层扫描提高了质量分辨率，降低了噪声水平，并提高了成分分析精度。实验证据表明，Ni2+、Al2+和Cr2+离子主要通过热激活蒸发过程形成，而非通过1+电荷态离子的后电离形成。对检测到的噪声水平的分析表明，对于适当选择的仪器参数，在PLAP断层扫描过程中，Ni-6.5 Al-9.5 Cr（原子百分比）尖端不存在明显的稳态加热现象。
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