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用俄歇谱仪和扫描电镜研究了锡、磷、稀土在α铁晶界上的偏聚行为及它们之间的交互作用。结果表明、锡、磷和稀土均有在α铁晶界上偏聚的倾向。在低硫磷Fe-Sn合金中加入稀土,可以减少锡在α铁晶界上的偏聚,锡的偏聚随稀土量的增加而减少。在高磷Fe-Sn-P合金中磷减弱了锡在晶界上的偏聚,加入稀土后磷在α铁晶界上的偏聚因稀土的偏聚而减弱,此减弱的趋势随着稀土量的增加而增加。稀土加入到Fe-Sn或Fe-Sn-P合金中,可以抑制α铁的低温晶界脆断。
The segregation behavior of tin, phosphorus and rare earth on α-iron grain boundary and the interaction between them were studied by Auger spectroscopy and scanning electron microscopy. The results show that both tin, phosphorus and rare earth tend to segregate on α-iron grain boundaries. The addition of rare earth in the low-phosphorus Fe-Sn alloy can reduce the segregation of tin on the α-iron grain boundaries, and the segregation of tin decreases with the increase of the amount of rare earth. Phosphorus in high-phosphorus Fe-Sn-P alloy weakens the segregation of tin on the grain boundaries. The segregation of phosphorus on the α-iron grain boundaries by the addition of rare earth decreases due to the segregation of rare earths. Increase in the amount of increase. Rare earth added to the Fe-Sn or Fe-Sn-P alloy, α-iron can inhibit the low-temperature grain boundary brittle fracture.