The air oxidation behaviors of two Cu-Ni alloys with 10% Ni(mass fraction) but widelydifferent grain sizes have been investigated at 800 and 900℃. Both alloys formed external scales containingan outer farer of CuO especially at 800℃ plus an inner layes of Cu2O.The inner scale is the porous Cu2OmatriX containing a fine distribution of NiO particles. Moreover, an internal oxidation zone of nickel appearsin the alloy. Finally, the growth rates of the external and internal oxide scales of the alloys with small grainsize are both faster than those with bigger grain size. The differences observed above are attributed tolarger effective diffusion coefficients of oxygen and copper both in the alloy and scales, which result from adecrease of the grain size.....Details,please contact the auther, editor directly.

研究了晶粒尺寸差异显著的两种Ｎｉ含量（质量分数，％，下同）为１０％的Ｃｕ基合金在８００～９００℃空气中的氧化．两种合金的氧化膜结构类似，外层由ＣｕＯ和内侧较厚的Ｃｕ２Ｏ组成，内层为多孔的分布着ＮｉＯ颗粒的Ｃｕ２Ｏ，并发生了Ｎｉ的内氧化．具有较小晶粒尺寸的合金内外氧化膜生长速率均高于粗晶合金．这种差异在于细晶合金中合金与氧化膜的晶粒尺寸降低后提供了更多的晶界短路扩散通道，从而增加了氧在合金中及氧与Ｃｕ在氧化膜中的有效扩散系数．

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