A comparison of Auger and STEM‐EDS quantification routines used in an investigation of intergranular segregation in long‐term aged nimonic PE16

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Abstract
The grain boundary composition of long‐term aged Nimonic PE16 has been investigated by both Auger electron spectroscopy (AES) and scanning transmission electron microscopy‐energy dispersive spectroscopy (STEM‐EDS) analysis, and a detailed comparison made of the quantification routines developed for the two techniques.The investigation showed that Mo, Cr and P segregate to the grain boundaries of the alloy during the standard pre‐service heat treatment, and that on extended ageing, at 450°C for 10 000 h and 550°C for 5000 h, the concentration of these elements at the grain boundaries increases. Furthermore, it was shown that there was good agreement between the two quantification routines developed to interpret the EDX and Auger spectra, allowing for the errors inherent in each method.