Hot Corrosion of Nickel alloys for aero-engine applications

您的项目将有助于了解耐火元素对镍高温合金腐蚀的基本影响。镍基高温合金因其优异的高温力学性能而被广泛应用于航空发动机的涡轮机叶片和轮盘。罗尔斯·罗伊斯公司作为世界领先的航空发动机制造商，对了解服役中合金的失效机理有着浓厚的兴趣，以改善它们。当暴露于含硫化合物时，一些镍基高温合金比其他合金失效得更快，然而，其机制尚不清楚。当合金暴露于腐蚀性气体和熔融盐时，诸如Mo、W、Re和Ru的难熔元素可加速腐蚀速率。需要系统研究生产具有不同组成的合金，将耐火材料（Mo/W）与形成保护性氧化物的元素（Cr/Al）交换，以了解这些元素的影响。您的项目将涉及新合金的生产，先进的表征技术，如扫描/透射电子显微镜，原子探针断层扫描和同步加速器技术。它将涉及不同环境下的机械测试和一些热力学建模，以了解故障机制。

Your project will help understand the fundamental effect of refractory elements on nickel superalloy corrosion. Nickel superalloys are used in the turbine blades and discs of aero-engines because of their outstanding mechanical properties up to elevated temperatures. Rolls-Royce plc, as a world leading aero-engine manufacturer, has a strong interest in understanding the failure mechanisms of alloys in service, in order to improve them. Some nickel-based superalloys fail substantially faster than others when exposed to sulphur-containing compounds, however, the mechanisms are not well understood. Refractory elements such as Mo, W, Re and Ru can accelerate the rate of corrosion when the alloy is exposed to corrosive gases and molten salts. A systematic study producing alloys with varying compositions that swap refractories (Mo/W) with elements that form protective oxides (Cr/Al) is required to understand the effect of those elements. Your project will involve the production of new alloys, advanced characterisation techniques such as scanning/transmission electron microscopy, atom probe tomography and synchrotron-based techniques. It will involve mechanical testing under different environments and some thermodynamic modelling to understand the failure mechanisms.