Nanomechanical investigations of plasticity in topologically close-packed phases at high temperatures

高温下拓扑密堆积相塑性的纳米力学研究

基本信息

项目摘要

The scientific aim of this project is the comprehensive characterisation of plasticity in the intermetallic, topologically close packed precipitates (TCP phases) which form, for example, in the highly alloyed superalloys. They affect rafting during creep and are associated with a reduction in lifetime by the initiation of cracks and the softening of the matrix by extraction of important alloying elements.In the first phase of this project, the mechanical properties, deformation mechanisms and defect structure of the µ-phase Fe7Mo6 have been investigated using micromechanical test methods in combination with scanning and (high resolution) transmission electron microscopy. First investigations of the σ-phase revealed a stoichiometry dependence of its deformation. Within the scope of this work, a computer-assisted analysis for unknown glide planes in complex crystals has been developed and implemented which has accelerated and expanded the identification of slip traces formed around indentation. In addition, the nanoindentation methods was expanded to now reach the operating temperature of superalloys at 1000 °C.Based on these results, a complete determination of the deformation mechanisms, their thermal activation and dependence on stoichiometry is planned for the µ, σ und Laves TCP phases in the technically relevant Fe-Mo system. To this end, micromechanical test methods, such as nanoindentation, high temperature nanoindentation, nanoindentation-strain rate jump testing and micropillar compression will be used and combined with subsequent analysis to the atomic scale. Here, the focus will be laid on the comparison of the deformation mechanisms and dislocation structures in the pure Laves phase and the Laves phase layers within the µ-phase. The existing results have shown that at room temperature deformation of the µ-phase occurs by synchroshear on the Laves triple layers. Consideration of deformation of complex crystals based not on a complete unit cell, but rather its constituent sub-cells, would make the categorisation and identification of suitable complex intermetallic phases for defined applications much easier. We therefore expect that the planned investigations will affect the evaluation of future applicability of complex intermetallic phases and the effects of alloying elements, for example in high temperature applications or as reinforcement phases in high strength materials.
该项目的科学目标是全面表征金属间化合物、拓扑紧密堆积的沉淀物(TCP相)的塑性,这些沉淀物例如在高合金化的高温合金中形成。在本项目的第一阶段,我们采用微观力学测试方法,结合扫描和(高分辨率)透射电子显微镜,对微米相Fe 7 Mo 6的力学性能、变形机制和缺陷结构进行了研究。第一次调查的σ相揭示了其变形的化学计量依赖。在这项工作的范围内,一个计算机辅助分析未知的滑移面在复杂的晶体已经开发和实施,加速和扩大周围压痕形成的滑移痕迹的识别。此外,纳米压痕方法被扩展到现在达到1000 °C的高温合金的工作温度。基于这些结果,计划对技术相关的Fe-Mo系统中的μ,σ和Laves TCP相的变形机制,其热活化和对化学计量的依赖性进行完整的确定。为此,将使用纳米压痕、高温纳米压痕、纳米压痕-应变率跳跃测试和微柱压缩等微机械测试方法,并与随后的原子尺度分析相结合。在此,重点将放在纯Laves相和μ相内的Laves相层中的变形机制和位错结构的比较上。现有结果表明,在室温下,通过Laves三层上的同步剪切,µ相发生变形。考虑复杂晶体的变形不是基于完整的晶胞,而是基于其组成的子晶胞,这将使得用于限定应用的合适的复杂金属间相的分类和识别容易得多。因此,我们预计计划中的研究将影响复杂金属间相的未来适用性和合金元素的影响的评估,例如在高温应用中或作为高强度材料中的增强相。

项目成果

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Professorin Dr. Sandra Korte-Kerzel, Ph.D.其他文献

Professorin Dr. Sandra Korte-Kerzel, Ph.D.的其他文献

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{{ truncateString('Professorin Dr. Sandra Korte-Kerzel, Ph.D.', 18)}}的其他基金

Electro-plasticity in Al-Cu eutectic alloys
Al-Cu 共晶合金的电塑性
  • 批准号:
    319419837
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Creep resistant zinc alloys: Towards thermodynamic and mechanical stability by microalloying
抗蠕变锌合金:通过微合金化实现热力学和机械稳定性
  • 批准号:
    316450342
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Control and prediction of electromagnetically favourable microstructure of electrical sheet based on crystal plasticity and heat treatment
基于晶体塑性和热处理的电工板材电磁有利微观结构控制与预测
  • 批准号:
    255711070
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Research Units

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O-联糖基化可塑性调控及其功能意义的研究
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    2656420
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突触前和突触后可塑性的研究
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内在大脑网络的动态性质的研究
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