中文摘要：

研究了Cu-40Ni-12Cr-2.5Al合金在700～800℃纯氧气中的氧化行为以及添加Al对Cu-Ni-Cr合金氧化行为的影响.结果表明：合金氧化动力学偏离抛物线规律,800℃时的氧化增重明显低于700℃,两种温度下的氧化增重与前面研究的Cu-40Ni-20Cr合金相比明显降低;合金表面形成的氧化膜外层主要是不连续Cu的氧化物层,紧接着是Cu、Ni、Cr和Al的混合氧化物层,而在合金内部形成了连续且具有保护性的Cr2O3膜.可见,添加第4组元Al到Cu-Ni-Cr合金后,活泼组元Cr由合金内部向外扩散的速度加快,因此在较低Cr含量下合金能形成连续的Cr2O3膜.

英文摘要：

The oxidation of a quaternary two-phase Cu-40Ni-12Cr-2.5A1 alloy formed by the 2.5at％ Al addition to Cu-Ni-Cr alloy were investigated at 700～800 ℃ in 0.1 MPa pure oxygen,and the effect of adding the forth component Al on the oxidation of Cu-Ni-Cr alloy was also discussed.Results show that kinetic curves of the present alloy deviate considerably from the parabolic rate law and the mass gain at 700 ℃ is higher than that at 800 ℃.Moreover,the mass gain of the Cu-40Ni-12Cr-2.5Al alloy is lower than that of the Cu-40Ni-20Cr alloy evidently.The Cu-40Ni-12Cr-2.5Al alloy form uncontinuous external CuO scales followed by the mixed scales composed of Cu,Ni and Cr oxides.Finally,the alloys form a very thin and continuous Cr2O3 scales in contact with the alloy.Obviously,adding the forth component A1 to Cu-Ni-Cr alloy is able to decrease the critical content to form Cr oxide and facilitates the formation of continuous Cr2O3 scales under much lower Cr content in spite of the simultaneous presence of two phase in the alloy.