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首页> 外文期刊>Materials at High Temperatures >Oxidation of orthorhombic Ti_2AINb alloys in the temperature range 550-1000 deg C in air
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Oxidation of orthorhombic Ti_2AINb alloys in the temperature range 550-1000 deg C in air

机译：正交晶Ti_2AINb合金在空气中550-1000℃的氧化

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Orthorhombic titanium aluminides offer the potential to substitute the current titanium alloys in aero engines, gas turbines and automotive turbo-chargers. The advantages are a wider range of thermo mechanical processing possibilities, a higher room temperature ductility, increased high temperature strength and better oxidation as well as titanium fire resistance. Nevertheless, uncertainties with regard to their oxidation behaviour presently impede their use in practical applications. In the present study a very detailed investigation of the oxide scales formed and of the resulting metal subsurface structures after oxidation for up to 1000 h was performed. The results show that both the oxide scale and the subsurface zone develop very complex structures which are responsible whether protective or non-protective behaviour is observed. In principle the oxidation behaviour of the three alloys investigated can be characterised by three types designated as type I, II or III. Each of these types has a characteristic scale structure and a different degree of protection and their occurrence depends on alloy composition and oxidation time. From a technical point of view the interstitial dissolution of oxygen in the metal subsurface zone plays an important role as this process can lead to severe embrittlement. The extent of the IAZ (interstitial affected zone) depends on the oxide scale structure. The paper presents the results from detailed metallographic and microprobe investigations which throw further light on the complex oxidation processes of this group of materials.
机译：斜方晶铝化钛具有替代航空发动机，燃气轮机和汽车涡轮增压器中现有钛合金的潜力。优点是可以进行更广泛的热机械加工，更高的室温延展性，更高的高温强度和更好的氧化性以及钛合金的耐火性。然而，关于它们的氧化行为的不确定性目前阻碍了它们在实际应用中的使用。在本研究中，对形成的氧化皮和氧化后长达1000小时的所得金属亚表面结构进行了非常详细的研究。结果表明，氧化皮和地下区域都形成了非常复杂的结构，这些结构决定了是否观察到保护性行为。原则上，所研究的三种合金的氧化行为可以用三种类型的I，II或III型表征。这些类型中的每一种都具有特征性的鳞片结构和不同的防护等级，它们的出现取决于合金成分和氧化时间。从技术角度来看，氧气在金属地下区域的间隙溶解起着重要作用，因为此过程可能导致严重的脆化。 IAZ（间隙影响区）的范围取决于氧化皮结构。本文介绍了详细的金相和微探针研究的结果，这些研究进一步阐明了这组材料的复杂氧化过程。

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