采用静态增重法测定了GH4720Li合金在650～900℃的氧化动力学,并利用SEM、EDS和XRD手段分析了不同温度下氧化膜的组成及结构,据此对GH4720Li合金的氧化机制进行了研究.结果表明.GH4720Li合金在900℃以下属完全抗氧化级.750℃以下,GH4720Li合金的氧化速率随温度升高缓慢增加,氧化膜主要由(Cr0.88Ti0.12)2O3和Cr2NiO4组成;超过750℃,合金的氧化速率显著增加,氧化层主要由(Cr0.88Ti0.12)2O3和TiO2组成.Ti的含量沿氧化层厚度方向由里向外逐渐增加,而Cr的分布规律正好相反.合金氧化动力学遵循抛物线规律,氧化机制由初始表面生成反应控制转变为扩散机制控制.
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