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Phase selection and mechanical properties of a directionally solidified Cr-20Nb-40Ti alloy

机译：定向凝固Cr-20Nb-40Ti合金的相选择和力学性能

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摘要

By combining the techniques of directional solidification and coating Y_2O_3, a Cr-20Nb-40Ti alloy was manufactured successfully with various growth rates. The revolution of microstructures and corresponding mechanical properties was discussed to develop the Cr_2Nb based alloys with good combination of mechanical properties. The results show that the favorable growth dynamics of plane (220) of Laves phase Cr_2Nb was observed with the increase of growth rate. Phase selection took place in microstructures evolved from the primary Cr_2Nb, via the dendrite-like eutectic Cr_2Nb/β-Ti, and finally to the primary β-Ti, with increasing the growth rate from 5 to 200 um/s. Based on the coupled zone of eutectic, the competitive growth of solidified phases in the directionally solidified Cr-20Nb-40Ti alloy was elucidated. In addition, the mechanical properties of alloy depended on the growth rate, and the fracture toughness of the alloy reached 16.50 MPa m~(1/2) at 200 μm/s, much larger than 1.40 MPa m~(1/2) for single-phase Cr_2Nb.
机译：通过结合定向凝固和涂覆Y_2O_3技术，成功地制造了具有各种生长速率的Cr-20Nb-40Ti合金。讨论了微观结构的革命和相应的机械性能，以开发具有良好机械性能组合的Cr_2Nb基合金。结果表明，随着生长速率的增加，Laves相Cr_2Nb的（220）面具有良好的生长动力学。相选择发生在从原始Cr_2Nb经由枝晶状共晶Cr_2Nb /β-Ti到最终到达原始β-Ti的微观结构中，生长速率从5 um / s增加到200 um / s。基于共晶耦合区，阐明了定向凝固Cr-20Nb-40Ti合金中凝固相的竞争性生长。另外，合金的力学性能取决于生长速率，在200μm/ s时的断裂韧性达到16.50 MPa m〜（1/2），远大于1.40 MPa m〜（1/2）。单相Cr_2Nb。

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  • 来源
    《Journal of Materials Research》 |2015年第22期|3474-3483|共10页
  • 作者

    Yunlong Xue; Shuangming Li; Hong Zhong; Kewei Li; Hengzhi Fu;

  • 作者单位

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072 Shanxi, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072 Shanxi, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072 Shanxi, China;

    College of Material Science and Engineering, Taiyuan University of Technology, Taiyuan 030024 Shanxi, China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072 Shanxi, 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);
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  • 正文语种 eng
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