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首页> 外文期刊>Materials Science and Engineering >Microstructure and mechanical properties of Ti-52 at% Al alloy synthesized in-situ via dual-wires electron beam freeform fabrication
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Microstructure and mechanical properties of Ti-52 at% Al alloy synthesized in-situ via dual-wires electron beam freeform fabrication

机译：通过双线电子束自由形式制造的Ti-52在原位合成的Ti-52的微观结构和机械性能

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摘要

The in-situ synthesized Ti-52 at% Al alloy was additively manufactured for the first time by electron beam freeform fabrication (EBF~3) with pure Ti and Al wires. The chemical compositions, microstructure, crystal orientation and mechanical properties of the Ti-52 at% Al walls were investigated. The results show that the actual Al content was lower than that the designed content due to the evaporation of elements. The micro-structure of the as-fabricated walls was composed of γ dendrite which was oriented along the <111> direction. The solidification path was L→γ phase due to the high cooling rate during EBF~3 process. The primary dendrite spacing and the width of the secondary dendrite increased with the building height indicating that the cooling rate decreased. The dendrite disappeared in layer bands due to the repeating thermal cycles. Based on the orientation analysis, the epitaxial growth of the γ phase was found between the dendritic and interdendritice regions and between layers. The microhardness of the dendrite was higher than that of the interdendritic regions. The compressive tests at ambient temperature indicated anisotropic mechanical properties due to the dendrite structure. The compressive strength along the building direction was higher than that along the deposited direction.
机译：通过电子束自由形状制造（EBF〜3）首次用纯Ti和Al导线加恰当地制造％Al合金的原位合成的Ti-52。研究了Ti-52在％Al壁的化学组合物，微观结构，晶体取向和机械性能。结果表明，由于元素蒸发，实际的Al含量低于设计内容。由γ树枝状的γ树枝状的微结构由沿<111的方向取向。由于EBF〜3过程中的高冷却速率，凝固路径是L→γ相。初级枝晶间距和次级树枝状的宽度随建筑物高度而增加，表明冷却速率降低。由于重复的热循环，枝晶在层带中消失。基于取向分析，在树突和跨多种子区和层之间发现γ相的外延生长。树突的显微硬度高于中生区域的微硬度。由于树突结构，环境温度的压缩试验指示各向异性机械性能。沿建筑方向的压缩强度高于沿沉积方向的压缩强度。

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  • 来源
    《Materials Science and Engineering》 |2020年第4期|140232.1-140232.9|共9页
  • 作者

    Junqiang Xu; Yong Peng; Qi Zhou; Jikang Fan; Jian Kong; Kehong Wang; Shun Guo; Jun Zhu;

  • 作者单位

    School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology Nanjing University of Science and Technology Nanjing 210094 China;

    School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology Nanjing University of Science and Technology Nanjing 210094 China;

    School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology Nanjing University of Science and Technology Nanjing 210094 China;

    School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology Nanjing University of Science and Technology Nanjing 210094 China;

    School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology Nanjing University of Science and Technology Nanjing 210094 China;

    School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology Nanjing University of Science and Technology Nanjing 210094 China;

    School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology Nanjing University of Science and Technology Nanjing 210094 China;

    Nanjing Institute of Technology Nanjing 211167 China;

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

    Titanium aluminides; Electron beam freeform fabrication; Microstructure; Epitaxial growth; Mechanical properties;

    机译：钛铝化物;电子束自由形式制造;微观结构;外延生长;机械性能;

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