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首页> 外文期刊>High temperature materials and processes >Microstructure and Mechanical Property Optimization of NiTiAl-based Alloys: Directional Solidification in Novel Ceramic Crucibles
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Microstructure and Mechanical Property Optimization of NiTiAl-based Alloys: Directional Solidification in Novel Ceramic Crucibles

机译：NiTiAl基合金的显微组织和力学性能优化：新型陶瓷坩埚中的定向凝固

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摘要

Directional solidification technique was successfully used to prepare highly reactive NiTiAl-based alloys using novel Y_2O_3-coated crucibles. Compared with the as-cast alloys fabricated by vacuum arc melting, the microstructure of the directionally solidified alloys was optimized and mechanical properties remarkably improved. After directional solidification, the microstructure of the alloys became much finer and preferentially grew along [001] orientation. The tensile strength and strain of the directionally solidified alloys at 1550℃were promoted to 1240 MPa and 2.1% respectively, which were 91.4% and 75% higher than that of the as-cast alloys. The strength increased up to 1328 MPa and 1419 MPa after homogenizing treating. The Y_2O_3-coated crucibles assured significant purification effect of the alloys. The maximum oxygen increase in the steady-state region of the ingot obtained at 1750℃was no more than 0.014 wt.%.
机译：定向凝固技术已成功用于使用新型Y_2O_3涂层坩埚制备高反应性NiTiAl基合金。与通过真空电弧熔化制备的铸态合金相比，定向凝固合金的微观结构得到优化，并且机械性能得到显着改善。定向凝固后，合金的微观结构变得更细，并优先沿[001]方向生长。定向凝固合金在1550℃的抗拉强度和应变分别提高到1240 MPa和2.1％，比铸态合金分别高91.4％和75％。均质处理后，强度提高到1328 MPa和1419 MPa。涂有Y_2O_3的坩埚确保了合金的显着净化效果。在1750℃下获得的铸锭的稳态区域中最大的氧增加不超过0.014wt。％。

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  • 来源
    《High temperature materials and processes》 |2013年第4期|353-358|共6页
  • 作者

    Huarui Zhang; Xiaoxia Tang; Qing Pan; Lei Zhou; Chungen Zhou; Hu Zhang;

  • 作者单位

    School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

    School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

    School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

    School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

    School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

    School of Materials Science and Engineering, Beihang University, Beijing 100191, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    NiTiAl-based alloy; microstructure; mechanical property; crucible; directional solidification;

    机译：INiTiAl基合金;微观结构机械性能坩;定向凝固;

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