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首页> 外文期刊>Journal of Materials Research >Cooling rate dependent undercooling of Bi in a Zn matrix by differential fast scanning calorimetry
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Cooling rate dependent undercooling of Bi in a Zn matrix by differential fast scanning calorimetry

机译：差示快速扫描量热法测定锌基中铋的冷却速率依赖性过冷

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摘要

We presented the investigation on the cooling rate dependent undercooling of the microsized and nanosized Bi droplets in the Zn matrix via differential fast scanning calorimetry at scanning rates ranging from 300 to 6000 K/s. The experimental results demonstrated that the embedded nanosized Bi droplets gave more reproducible undercooling measurements than that of microsized Bi droplets at the grain boundaries. In addition, different cooling rate dependences of undercooling of microsized and nanosized Bi droplets were found. When the cooling rate is increased from 300 to 6000 K/s, the undercooling of the embedded nanosized Bi droplets increased gradually from 125 to 130 K. However, for microsized Bi droplets at the grain boundaries, there was an obvious increase of undercooling when the cooling rate was higher than 2000 K/s. In other words, the undercooling evolution displayed a sigmoidal relationship with the increase in cooling rate, indicating the change of the heterogeneous nucleation mechanism from a surface-induced mode to a volume-induced one.
机译：我们提出了通过差速快速扫描量热法以300至6000 K / s的扫描速度对Zn基体中的微米级和纳米级Bi液滴进行冷却速率依赖性过冷的研究。实验结果表明，与晶粒边界处的微细Bi液滴相比，嵌入的纳米B​​i液滴可提供更可再现的过冷测量结果。此外，发现了微米级和纳米级Bi液滴过冷的不同冷却速率依赖性。当冷却速率从300 K / s增加到6000 K / s时，埋藏的纳米Bi液滴的过冷度从125 K逐渐增加到130K。但是，对于晶界处的微细Bi液滴，当纳米晶Bi的液滴过冷时，过冷度明显增加。冷却速度高于2000 K / s。换句话说，过冷演化与冷却速率的增加呈S形关系，表明非均相成核机制从表面诱导模式转变为体积诱导模式。

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  • 来源
    《Journal of Materials Research》 |2015年第2期|242-247|共6页
  • 作者

    Linfang Li; Bingge Zhao; Bin Yang; Quanliang Zhang; Qijie Zhai; Yulai Gao;

  • 作者单位

    Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, People's Republic of China;

    Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, People's Republic of China;

    Institute of Physics, University of Rostock, Rostock 18051, Germany;

    Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, People's Republic of China;

    Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, People's Republic of China;

    Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, People's Republic of China Laboratory for Microstructures, Shanghai University, Shanghai 200444, 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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