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首页> 外文学位 >In-situ scanning electron microscopy (sem) observations of the tensile and tensile-creep deformation of Titanium-8Aluminum-1mo-1v (wt.%) alloy.
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In-situ scanning electron microscopy (sem) observations of the tensile and tensile-creep deformation of Titanium-8Aluminum-1mo-1v (wt.%) alloy.

机译：原位扫描电子显微镜（sem）观察Titanium-8Aluminum-1mo-1v（wt。％）合金的拉伸和拉伸蠕变变形。

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摘要

Titanium (Ti) and titanium alloys (Ti alloys) are attractive for structural applications, such as in the aerospace and automotive industries due to their high specific strength, excellent corrosion resistance and good ability to withstand elevated temperatures. To develop Ti alloys with better mechanical properties, it is necessary to comprehend the deformation behavior of available Ti alloys. Previous studies performed by another graduate student, Dr. Hongmei Li, involved investigation of the deformation behavior of commercially pure (CP) Ti, Ti-5Al-2.5Sn (wt.%), Ti-3Al-2.5V (wt.%) and Ti-6Al-4V (wt.%) alloys. The current thesis focused on investigating the deformation behavior of Ti-8Al-1Mo-1V (wt.%). In-situ tensile and tensile-creep experiments were performed at temperatures ranging from room temperature (RT) to 650OC inside a scanning electron microscope (SEM), which allowed for the observation of the surface deformation evolution. Electron Back Scattered Diffraction (EBSD) was used to identify the distribution of the active deformation systems. In this thesis efforts were made to characterize the various deformation modes of the Ti-8Al-1Mo-1V (wt.%) alloy as a function of the testing conditions (stress and temperature). It was observed that prismatic slip made up the majority of the observed slip systems during the RT tensile deformation, while basal and prismatic slip were almost equally active during the 455OC tensile deformation. Grain boundary ledges were observed during the elevated temperature tensile-creep deformation and from this observation it was suggested that grain boundary sliding was an active deformation mode. This work also involved estimating the Critical Resolved Shear Stress (CRSS) ratios of the alpha-phase deformation modes. The CRSS ratios were compared with the CRSS ratios of CP Ti and other Ti alloys. Overall, this work was intended to add more data to the scientific literature of Ti alloys in order to better comprehend their deformation modes, so as to design and develop higher performance Ti alloys.
机译：钛（Ti）和钛合金（Ti合金）具有很高的比强度，出色的耐腐蚀性和良好的耐高温能力，因此在航空航天和汽车工业等结构应用中具有吸引力。为了开发具有更好机械性能的钛合金，有必要理解可用的钛合金的变形行为。另一位研究生李红梅博士进行的先前研究涉及对商业纯（CP）Ti，Ti-5Al-2.5Sn（wt。％），Ti-3Al-2.5V（wt。％）的变形行为进行研究和Ti-6Al-4V（wt。％）合金。目前的研究重点是研究Ti-8Al-1Mo-1V（wt。％）的变形行为。在扫描电子显微镜（SEM）内从室温（RT）到650OC的温度下进行了原位拉伸和拉伸蠕变实验，从而可以观察表面变形的演变。电子背散射衍射（EBSD）用于识别主动变形系统的分布。本文试图根据测试条件（应力和温度）表征Ti-8Al-1Mo-1V（wt。％）合金的各种变形模式。可以观察到，在RT拉伸变形过程中，棱柱形滑移构成了观察到的滑移系统的大部分，而在455OC拉伸变形过程中，基底滑移和棱柱形滑移的活动几乎相同。在高温拉伸蠕变变形过程中观察到晶界壁架，从这一观察结果可以看出，晶界滑动是一种主动变形模式。这项工作还涉及估算α相变形模式的临界分辨剪切应力（CRSS）比率。将CRSS比率与CP Ti和其他Ti合金的CRSS比率进行比较。总的来说，这项工作旨在为钛合金的科学文献增加更多的数据，以便更好地理解其变形模式，从而设计和开发性能更高的钛合金。

著录项

  • 作者

    Ghosh Dastidar, Indraroop.;

  • 作者单位

    Michigan State University.;

  • 授予单位 Michigan State University.;
  • 学科 Engineering Materials Science.;Engineering Mechanical.
  • 学位 M.S.
  • 年度 2014
  • 页码 102 p.
  • 总页数 102
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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