Thermo mechanical effects on Ti deformation mechanisms in cold dwell

热机械效应对冷驻留钛变形机制的影响

• 批准号: 2879298
• 金额: --
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2879298
• 关键词: Thermo; mechanical; effects; Ti; deformation

yclic loading is characteristic of components in an aero-engines, where they are exposed to both low frequency (e.g. take off and landing), and high frequency (e.g vibration) loading. Therefore it is very important to understand what gives Ti alloys their fatigue strength, and in particular how it is affected by the load frequency and by other environmental parameters like temperature. Through extensive testing, engineers have developed sound empirical relationships between fatigue strength and the microstructure of different Ti alloys. However, the actual physical mechanisms controlling this behaviour are not fully understood. This gap in our knowledge makes it difficult to account for material and/or operating conditions outside previous experience. It also makes it difficult to understand how the alloy could be improved, so that less of it can be used, which would help build lighter, more efficient aero-engines. The aim of this project is to improve our understanding of how these important alloys deform at the micro-structural scale during low frequency cyclic loading, and at different temperatures. Working in collaboration with Rolls-Royce, you will use new experimental techniques developed at the University of Manchester to measure the deformation of these alloys with sub-micron spatial resolution, helping to unravel the physical process that lead to fatigue failure and damage and understand how they can be avoided. This work will make use of unique state-of-the-art facilities available at the Royce Institute at Manchester (www.royce.ac.uk), including high-resolution electron microscopes with in-situ testing capability, machines for 3-dimensional crystal orientation mapping, and high resolution transmission electron microscopes. The successful candidate will join a large team of researchers (10+) working on titanium alloys at Manchester, and collaborate with scientists and engineers at Rolls-Royce and other UK and international universities. The project provides access and training on some of the most advanced characterisations methods currently available and sound training in advanced data analysis using open source packages. There will also be opportunities to visit Rolls-Royce and other partner organisations.

循环载荷是航空发动机中的部件的特征，在航空发动机中，它们受到低频（例如起飞和着陆）和高频（例如振动）载荷。因此，了解钛合金的疲劳强度是什么，特别是它如何受到载荷频率和其他环境参数（如温度）的影响是非常重要的。通过大量的测试，工程师们已经开发出不同钛合金的疲劳强度和微观结构之间的良好经验关系。然而，控制这种行为的实际物理机制尚未完全了解。我们知识的这一差距使我们难以解释先前经验之外的材料和/或操作条件。这也使得人们很难理解如何改进这种合金，从而减少使用，这将有助于制造更轻，更高效的航空发动机。这个项目的目的是提高我们对这些重要合金在低频循环载荷和不同温度下在微观结构尺度上如何变形的理解。与罗尔斯·罗伊斯合作，您将使用曼彻斯特大学开发的新实验技术，以亚微米空间分辨率测量这些合金的变形，帮助解开导致疲劳失效和损坏的物理过程，并了解如何避免它们。这项工作将利用曼彻斯特罗伊斯研究所（www.royce.ac.uk）提供的独特的最先进的设施，包括具有原位测试能力的高分辨率电子显微镜，三维晶体取向映射机器和高分辨率透射电子显微镜。成功的候选人将加入曼彻斯特的一个大型研究团队（10+），与劳斯莱斯和其他英国和国际大学的科学家和工程师合作。该项目提供了一些目前可用的最先进的表征方法的访问和培训，以及使用开源软件包进行高级数据分析的良好培训。我们还将有机会参观劳斯莱斯和其他合作伙伴组织。