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Effects of temperature and load on fretting fatigue induced geometrically necessary dislocation distribution in titanium alloy

机译：温度和负荷对钛合金诱导的几何必要脱位分布的影响

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摘要

The effects of temperature and load on fretting fatigue induced geometrically necessary dislocation (GND) distribution in titanium alloy are studied by electron back-scattered diffraction (EBSD) in this paper. Fretting fatigue experiments under different temperature and load in TCI 1 titanium alloy are carried out and samples with small cracks are obtained. With Hough-based EBSD, the misorientation and GND densities induced by fretting fatigue are analyzed in both crack formation zone and crack tip. The results show that in the crack formation zone and crack tip, both temperature and load have obvious effects on the GND densities. With the increase of temperature and load, the GND densities rise significantly, which agrees with the decreasing tendency of fretting fatigue lives. The peak positions of GND density agree well with the crack formation locations, indicating the close relation between GND concentration and fretting fatigue crack formation. The relationship between GND density and distance from the crack path is studied. The results of individual GND densities on each slip system show that 'Pyramidal' and 'Screw' dislocations compose a majority of total GND density.
机译：通过电子背散衍射（EBSD）在本文中研究了温度和负荷对疲劳诱导的钛合金的几何必要位错（GND）分布的影响。在不同温度和TCI 1钛合金中进行的疲劳疲劳实验进行，并获得小裂缝的样品。通过基于霍夫的EBSD，在裂缝形成区和裂纹尖端中分析了疲劳疲劳引起的错误化和GND密度。结果表明，在裂缝形成区和裂纹尖端，温度和负荷均对GND密度具有明显的影响。随着温度和负荷的增加，GND密度显着上升，这同意疲劳疲劳生活的趋势降低。 GND密度的峰位置与裂缝形成位置吻合良好，表明GND浓度与微动疲劳裂纹之间的密切关系。研究了GND密度与裂缝路径距离之间的关系。每个滑动系统上的单个GND密度的结果表明，“金字塔纳米尔

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  • 来源
    《Materials Science and Engineering》 |2021年第7期|140308.1-140308.15|共15页
  • 作者

    Qinan Han; Xusheng Lei; Hao Yang; Xiaolin Yang; Zimu Su; Shao-Shi Rui; Nan Wang; Xianfeng Ma; Haitao Cui; Huiji Shi;

  • 作者单位

    Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China;

    Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China;

    AML Department of Engineering Mechanics Tsinghua University Beijing 100084 China;

    Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China;

    Department of Civil and Environmental Engineering Vanderbilt University Nashville TN37235 USA;

    AMPTL Department of Mechanical Engineering Tsinghua University Beijing 100084 China;

    Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China;

    Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen University Zhuhai 519082 China;

    Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China;

    AML Department of Engineering Mechanics Tsinghua University Beijing 100084 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fretting fatigue; EBSD; Geometrically necessary dislocation; Misorientation; Titanium alloy;

    机译：烦躁疲劳;EBSD;几何必要的错位;杂乱无章;钛合金;

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