Abstract The oxidation resistance in air of Ti-48Al-2Cr-2Nb, Ti-48Al-2Nb-0.7Cr-0.3Si, Ti-43.5Al-4Nb-1Mo and Ti-47Al-2Cr-8Nb alloys was investigated in the range of 800–1000 °C. Specimens were machined from the core of bars processed by Electron Beam Melting. Oxidation tests were performed in TGA equipment under isothermal conditions at different temperatures. The composition of the oxide layers was investigated by XRD, SEM-EDS and XPS. Layer exfoliation was observed, starting from different temperatures for the different alloys. When spallation did not happen in a significant extent the oxide layers grew according to a parabolic law. The kinetic rate constants and the activation energies were calculated. These kinetic parameters allowed to assess a rank of oxidation resistance, which can be correlated with the composition of the alloys.

中文翻译：

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复杂Ti-Al合金氧化动力学的热重研究

摘要 研究了 Ti-48Al-2Cr-2Nb、Ti-48Al-2Nb-0.7Cr-0.3Si、Ti-43.5Al-4Nb-1Mo 和 Ti-47Al-2Cr-8Nb 合金在空气中的抗氧化性，范围为800–1000 °C。试样由电子束熔炼加工的棒芯加工而成。在不同温度的等温条件下，在 TGA 设备中进行氧化测试。通过XRD、SEM-EDS和XPS研究了氧化层的组成。观察到层剥落，从不同合金的不同温度开始。当剥落没有在很大程度上发生时，氧化层根据抛物线规律生长。计算动力学速率常数和活化能。这些动力学参数允许评估抗氧化等级，其可以与合金的成分相关。