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首页> 外文期刊>Journal of Materials Research >Effect of cooling rates on solidification and microstructure of rapidly solidified Mg_(57)Zn_(37)Y_6 quasicrystal alloy
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Effect of cooling rates on solidification and microstructure of rapidly solidified Mg_(57)Zn_(37)Y_6 quasicrystal alloy

机译：冷却速率对快速凝固Mg_（57）Zn_（37）Y_6准晶体合金凝固和组织的影响

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摘要

The influence of cooling rates on the solidification and microstructure of rapidly solidified quasicrystal alloys with a nominal compositions of Mg_(57)Zn_(37)Y_6 (at.%) prepared by melt spinning method was investigated. The microstructure, phase constitution, phase transition, and phase structure of the alloys were examined by means of scanning electron microscopy, x-ray diffraction, energy dispersive spectrometer, differential scanning calorimetry, and transmission electron microscopy. The results show that rapid solidification refines and homogenizes the microstructure of Mg_(57)Zn_(37)Y_6 alloys, compared to the conventionally-cast master alloy. With the increasing cooling rate of rapid solidification, the thickness of the ribbon decreases greatly and a larger amount of Ⅰ-phase can be formed. α-Mg, MgZn, and icosahedral phases are found in the as-cast alloy, but the MgZn phase is absent from rapidly solidified alloys. The Ⅰ-phase in both as-cast and rapidly solidified alloys can precipitate directly from the melt during the solidification process. A higher cooling rate can lead to a large degree of supercooling, resulting in a decreased phase transition temperature and a large number of icosahedral short-range orders (ISROs). ISROs can act as templates in liquid and promote the nucleation of Ⅰ-phase.
机译：研究了冷却速率对通过熔体纺丝法制备的标称成分为Mg_（57）Zn_（37）Y_6（at。％）的快速凝固准晶体合金的凝固和组织的影响。通过扫描电子显微镜，x射线衍射，能量色散光谱仪，差示扫描量热法和透射电子显微镜检查了合金的微观结构，相组成，相变和相结构。结果表明，与常规铸造中间合金相比，快速凝固细化和均化了Mg_（57）Zn_（37）Y_6合金的微观结构。随着快速凝固冷却速度的增加，薄带的厚度大大减小，可以形成更多的Ⅰ相。在铸态合金中发现了α-Mg，MgZn和二十面体相，但快速凝固的合金中不存在MgZn相。铸造合金和快速凝固合金中的Ⅰ相在凝固过程中都可以直接从熔体中沉淀出来。较高的冷却速率会导致很大程度的过冷，从而导致降低的相变温度和大量的二十面体短程指令（ISRO）。 ISRO可以作为液体中的模板并促进Ⅰ相的成核。

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  • 来源
    《Journal of Materials Research》 |2015年第21期|3324-3330|共7页
  • 作者

    Min Xu; Xinying Teng; Jiwei Geng;

  • 作者单位

    School of Materials Science and Engineering, University of Jinan, Jinan 250022, Shandong Province, People's Republic of China;

    School of Materials Science and Engineering, University of Jinan, Jinan 250022, Shandong Province, People's Republic of China;

    State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of 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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