High Temperature Strain accommodation in MAX phase materials for advanced nuclear energy

先进核能 MAX 相材料的高温应变调节

基本信息

  • 批准号:
    2282513
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    英国
  • 项目类别:
    Studentship
  • 财政年份:
    2019
  • 资助国家:
    英国
  • 起止时间:
    2019 至 无数据
  • 项目状态:
    已结题

项目摘要

MAX phases are 2D-layered hexagonal carbides or nitrides that can exhibit very high mechanical damage tolerance at high temperatures. In common with ceramics, they are significantly less activated than metals by fast neutron irradiation. Hence they have potential applications in structural applications for advanced nuclear fission. However, the structure/property relationships and mechanisms of damage accumulation in MAX phases need to be better understood for microstructure-based modelling to support the design and development of materials and engineering components. MAX phase materials owe their unique properties to the tendency for crystal deformation by kink formation. This is a little understood phenomenon, but is similar to that observed in graphite. The influence of temperature and irradiation on kink formation is not understood, but theoretical studies have shown a strong link between the chemistry of the Max phase and the cleavage stress, which may affect the brittle/ductile transition. Better understanding of this fundamnetal mechanism would lead to the design of MAX phase materials with improved properties. The objectives of the project are to use high resolution electron backscatter diffraction to map grain orientations and to study the localisation of strain in phase pure MAX phase alloys from the TiAlC, ZrAlC and CrAlC systems, tested at elevated temperature. The effects of ion-irradiation on the deformation mechanisms will also be investigated. In particular, novel high temperature nano-indentation investigations will be performed, in grains of selected orientations, to study how plastic strain is accommodated within the crystal structure as a function of temperature. Sectioning of the deformation zone beneath nano-indentation will be done using focussed ion-beam milling, to enable high resolution transmission microscopy and transmission Kikuchi diffraction analysis. The studies aim, in particular, to understand how irradiation affects the mechanisms of deformation, as this will have impact on the transition between ductile and brittle behaviour at the macroscale. This project interacts closely with a parallel project, starting at the same time, that is conducting in situ studies of strain accommodation in bulk MAX phase materials for advanced nuclear energy using X-ray and neutron scattering and imaging. This project collaborates with SCK-CEN (Belgium) who are developing MAX phases for nuclear applications in conjunction with the European Energy Research Alliance Joint Programme in Nuclear Materials that aims to develop materials for next generation sustainable nuclear energy. The project also connects with the H2020 Il Trovatore programme on Innovative cladding materials for advanced accident-tolerant energy systems, in whicb mechanical testing (including studies of irradiated materials) is being conducted by SCK-CEN, together with electron-microscopy microstructure characterisation by EBSD, Transmission electron microscopy and ion-irradiation of MAX phase materials by Manchester University (Prof. P. Frankel) and Huddersfield University (Prof. K. Lambrinou). This project falls within the EPSRC Energy Research Theme (Nuclear Power)
MAX相是二维层状六方碳化物或氮化物,在高温下可表现出非常高的机械损伤容限。与陶瓷一样,它们在快中子辐照下的活性明显低于金属。因此,它们在先进核裂变的结构应用中具有潜在的应用。然而,在MAX阶段的结构/性能关系和损伤累积的机制需要更好地理解的微观结构为基础的建模,以支持材料和工程部件的设计和开发。MAX相材料的独特性能归因于通过扭结形成的晶体变形的趋势。这是一个很少理解的现象,但与石墨中观察到的相似。温度和辐照对扭结形成的影响尚不清楚,但理论研究表明,Max相的化学性质与解理应力之间存在密切联系,这可能会影响脆性/韧性转变。更好地理解这一基本机制将导致设计具有改进性能的MAX相材料。该项目的目标是使用高分辨率电子背散射衍射来映射晶粒取向,并研究在高温下测试的TiAlC,ZrAlC和CrAlC系统的纯MAX相合金中的应变局部化。离子辐照对变形机制的影响也将被研究。特别是,新的高温纳米压痕调查将进行,在选定的取向的晶粒,研究如何塑性应变是容纳在晶体结构作为温度的函数。将使用聚焦离子束铣削对纳米压痕下方的变形区进行切片,以实现高分辨率透射显微镜和透射菊池衍射分析。这些研究的目的是,特别是要了解如何照射影响变形机制,因为这将在宏观尺度上的韧性和脆性行为之间的过渡的影响。该项目与同时开始的一个平行项目密切互动,该项目正在利用X射线和中子散射和成像对先进核能用大体积MAX相材料的应变调节进行现场研究。该项目与SCK-CEN(比利时)合作,后者正在与欧洲能源研究联盟核材料联合计划合作开发用于核应用的MAX阶段,该计划旨在开发下一代可持续核能的材料。该项目还与H2020 Il Trovatore计划有关先进事故容限能源系统的创新覆层材料,其中机械测试(包括辐照材料的研究)正在进行的SCK-CEN,连同电子显微镜微观结构表征EBSD,曼彻斯特大学(P. Frankel教授)和哈德斯菲尔德大学(K. Lambrinou)。该项目福尔斯属于EPSRC能源研究主题(核电)

项目成果

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Internet-administered, low-intensity cognitive behavioral therapy for parents of children treated for cancer: A feasibility trial (ENGAGE).
针对癌症儿童父母的互联网管理、低强度认知行为疗法:可行性试验 (ENGAGE)。
  • DOI:
    10.1002/cam4.5377
  • 发表时间:
    2023-03
  • 期刊:
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Differences in child and adolescent exposure to unhealthy food and beverage advertising on television in a self-regulatory environment.
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  • DOI:
    10.1186/s12889-023-15027-w
  • 发表时间:
    2023-03-23
  • 期刊:
  • 影响因子:
    4.5
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The association between rheumatoid arthritis and reduced estimated cardiorespiratory fitness is mediated by physical symptoms and negative emotions: a cross-sectional study.
类风湿性关节炎与估计心肺健康降低之间的关联是由身体症状和负面情绪介导的:一项横断面研究。
  • DOI:
    10.1007/s10067-023-06584-x
  • 发表时间:
    2023-07
  • 期刊:
  • 影响因子:
    3.4
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ElasticBLAST: accelerating sequence search via cloud computing.
ElasticBLAST:通过云计算加速序列搜索。
  • DOI:
    10.1186/s12859-023-05245-9
  • 发表时间:
    2023-03-26
  • 期刊:
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Amplified EQCM-D detection of extracellular vesicles using 2D gold nanostructured arrays fabricated by block copolymer self-assembly.
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  • DOI:
    10.1039/d2nh00424k
  • 发表时间:
    2023-03-27
  • 期刊:
  • 影响因子:
    9.7
  • 作者:
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的其他文献

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核燃料模拟物的现场辅助烧结
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