基于团簇模型设计的Cu72.2% [Ni12/12+xSix/12+x] 27.8%合金氧化性能研究

dvanced Copper alloys or coatings often contain the ternary or more components in order to obtain the necessary combination of good mechanical properties and good corrosion resistance under working conditions. In this work, a series of Cu-based alloy compositions were designed, which was based on the stable solid solution cluster model for Cu-Ni-alloy established by C. Dong et al. By adjusting the proportion of Ni and Si to control the solid solution and the precipitation of Ni-Si, and at the same time keeping the constant atomic ration of Cu (72.2 at.%) in the alloys.Afterwards, the oxidation behavior of these alloys was studied. According to the result, the property of anti-oxidation of Cu-Ni-Si alloys was better than the pure copper, which shows that Ni、Si can restrain the oxidation process of copper to some extent, as well as delay the high-speed oxidation stage.There was no high-speed oxidation stage when Ni/Si atomic percentage ratio was 12/8.In all,there were several anti-oxidation mechanism of the Cu-Ni-Si alloy, the first one was that the alloy elements joined the copper in a cluster form ,it was helpful to form a stable structure of solid solution, which could reduce the Cu-Ni-Si alloy's chemical reactivity; The second one was the precipitation which spread all of the matrix. This kind of ternary silicide had notable anti-oxidation property.