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: 2615951
• 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: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2615951
• 关键词: Thermo; mechanical; effects; Ti; deformation

Cyclic 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部件的特征，它们同时承受低频（例如起飞和着陆）和高频（例如振动）载荷。因此，了解钛合金疲劳强度的来源非常重要，特别是负载频率和温度等其他环境参数对疲劳强度的影响。通过广泛的测试，工程师们在不同钛合金的疲劳强度和微观结构之间建立了良好的经验关系。然而，控制这种行为的实际物理机制尚未完全了解。我们知识上的这种差距使得很难解释以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合金，从而减少合金的使用量，从而有助于制造更轻、更高效的航空发动机。该项目的目的是提高我们对这些重要合金在低频循环加载期间和不同温度下如何在微观结构尺度上变形的理解。与劳斯莱斯合作，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，帮助揭示导致疲劳失效和损坏的物理过程，并了解如何产生疲劳失效和损坏。它们是可以避免的。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设施，包括具有现场测试能力的高分辨率电子显微镜、3 维机器晶体取向图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钛合金研究的大型研究团队（10 人以上），并与劳斯莱斯以及其他英国和国际大学的科学家和工程师合作。该项目提供目前可用的一些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。还有机会参观劳斯莱斯和其他合作伙伴组织。