The oxidation behaviors of a commercial C95500 nickel aluminum bronze (NAB) alloy at elevated temperatures were investigated. The oxide scale exhibited a triplex structure with an outmost CuAlO layer, an intermediate spinel-type AlO layer, and a deepest nano AlO film. The observation of CuAlO and AlO in the same grain with the same crystallographic orientation indicated that the outmost CuAlO was formed by directly consuming the spinel-type AlO. Such a transformation process can avoid the formation of defects in the oxide scale caused by the transformation between different AlO variants, attributing to the origin of the excellent oxidation resistance.

中文翻译：

---

高温下直接消耗 NAB 合金中的 Al2O3 形成 CuAl2O4 的观察

研究了商用 C95500 镍铝青铜 (NAB) 合金在高温下的氧化行为。氧化皮呈三层结构，最外层为CuAl2O3层，中间为尖晶石型Al2O3层，最深为纳米Al2O3薄膜。同一晶粒中具有相同晶体取向的 CuAlO 和 Al2O 的观察表明，最外层的 CuAlO 是通过直接消耗尖晶石型 Al2O 形成的。这样的转变过程可以避免由于不同Al2O变体之间的转变而导致氧化皮中形成缺陷，从而获得优异的抗氧化性。