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Characterization of the High Temperature Isothermal Oxidation Behaviour of an ATI425® Titanium Alloy
Oxidation of Metals ( IF 2.2 ) Pub Date : 2021-05-12 , DOI: 10.1007/s11085-021-10032-z
Omar A. Valdés-Saucedo , Roberto C. Rocha-Moreno , Javier H. Ramírez-Ramírez , Francisco A. Pérez-González , Rafael Colás , Nelson F. Garza-Montes-de-Oca

The isothermal oxidation behaviour of a titanium ATI425® alloy was studied in dry air at 850, 900, and 1000 °C. The parabolic rate law described the oxidation kinetics; the mass gained increasing when the temperature of the tests increased. The activation energy for the process was 120 kJ/mol. This value was comparable to the activation energy calculated for oxygen dissolution within the metal and the activation energy value for the oxidation of other titanium alloys. Oxygen dissolution within the metallic matrix resulted in the formation of an alpha case region whose thickness and hardness were also a function of the temperature of the tests. The chemical composition of the oxides changed from a scale comprised mainly by rutile TiO2 at the lowest test temperature to a layer consisting of a mixture of rutile TiO2 and non-protective alumina Al2O3 clusters when the temperature of the tests increased. The oxide structures formed on the surface of the alloy were also a function of the temperature and changed from a morphology comprised of small crystals at 850 °C to bar, platelets, and whiskers when oxidation occurred at 900 and 1000 °C. The oxidation rate of the alloy was compared against kinetics values reported for the Ti-6Al-4 V system, resulting in similar oxidation rates.



中文翻译:

ATI425®钛合金的高温等温氧化行为的表征

钛ATI425的等温氧化行为®合金在干燥空气中,在850,900的研究,和1000℃。抛物线速率定律描述了氧化动力学。当测试温度升高时,质量增加。该过程的活化能为120kJ / mol。该值与为氧溶解在金属中而计算出的活化能以及与其他钛合金的氧化所计算出的活化能相当。氧在金属基质中的溶解导致形成α壳区,该壳的厚度和硬度也是测试温度的函数。氧化物的化学组成从主要由金红石TiO 2组成的规模改变当温度升高时,在最低的测试温度下,金红石型TiO 2和非保护性氧化铝Al 2 O 3的混合物形成一层。合金表面形成的氧化物结构也是温度的函数,当在900和1000°C发生氧化时,其形态从850°C的小晶体变为棒状,片状和晶须。将合金的氧化速率与Ti-6Al-4 V系统报道的动力学值进行比较,得出相似的氧化速率。

更新日期:2021-05-12
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