Abstract
In virtue of Auger electron spectroscopy, the levels of grain-boundary segregation of phosphorus in Ni-based superalloy after solution-treated at 1200 °C for 9.8 h and at 1020 °C for 68.5 h and then aged at 720 °C all for 2 h are measured. It is found that the levels increase with the increase in solution treatment temperature. The measurement result is analysed with the laws of equilibrium segregation and non-equilibrium segregation. Based on the analysis, the characteristic of non-equilibrium grain-boundary segregation of phosphorus in the superalloy is confirmed for the first time.
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