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SURFACE COSEGREGATION OF CHROMIUM AND SULFUR IN SINGLE CRYSTALLINE AUSTENITICFe–Ni–CrALLOYS
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In this work we have studied cosegregation of sulfur and chromium on well-defined austenitic Fe–Cr–Ni alloy surfaces. For this purpose we have investigated (100)-oriented surfaces of Fe–14.8%Cr–17.8%Ni(cS=9 wt-ppm) and Fe–18%Cr–14%Ni (cS=18 wt-ppm) single crystals using Auger electron spectroscopy (AES) and low energy electron diffraction (LEED). Segregation experiments were carried out under UHV conditions at temperatures ranging from 500 to 900°C. Cosegregation of chromium and sulfur is very pronounced on the Fe–14.8%Cr–17.8%Ni(100) alloy surface, while on Fe–18%Cr–14%Ni(100) the surface concentration of cosegregated chromium is rather small. On both surfaces sulfur segregation is characterized by a c(2 × 2) LEED pattern. The results of the present study are compared with a previous study using ferritic Fe–15%Cr–S(100) alloy single crystals.
World Scientific Pub Co Pte Ltd
Title: SURFACE COSEGREGATION OF CHROMIUM AND SULFUR IN SINGLE CRYSTALLINE AUSTENITICFe–Ni–CrALLOYS
Description:
In this work we have studied cosegregation of sulfur and chromium on well-defined austenitic Fe–Cr–Ni alloy surfaces.
For this purpose we have investigated (100)-oriented surfaces of Fe–14.
8%Cr–17.
8%Ni(cS=9 wt-ppm) and Fe–18%Cr–14%Ni (cS=18 wt-ppm) single crystals using Auger electron spectroscopy (AES) and low energy electron diffraction (LEED).
Segregation experiments were carried out under UHV conditions at temperatures ranging from 500 to 900°C.
Cosegregation of chromium and sulfur is very pronounced on the Fe–14.
8%Cr–17.
8%Ni(100) alloy surface, while on Fe–18%Cr–14%Ni(100) the surface concentration of cosegregated chromium is rather small.
On both surfaces sulfur segregation is characterized by a c(2 × 2) LEED pattern.
The results of the present study are compared with a previous study using ferritic Fe–15%Cr–S(100) alloy single crystals.
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