Nucleation kinetics of paramagnetic and diamagnetic metal melts under a high magnetic field

Nucleation kinetics of paramagnetic and diamagnetic metal melts under a high magnetic field
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高磁场下顺磁性和反磁性金属熔体的成核动力学

DOI:
10.1016/j.jmst.2020.09.037
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发表时间:
2020-10
影响因子:
10.9
通讯作者:
Li Xi
Li Xi
中科院分区:
材料科学1区
文献类型:
--
作者:
Long Zhipeng;Jiang Qiuyue;Wang Jiantao;Hou Long;Yu Xing;Fautrelle Yves;Ren Zhongming;Li Xi

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用差热分析法研究了强磁场对顺磁性铝和反磁性锌熔体形核动力学的影响。结果表明,在相同的加热冷却速率下,HMF的加入增加了纯铝和纯锌的过冷度。此外,利用Kissinger方法从DTA结果计算的活化能的定量分析表明,HMF降低了纯铝和纯锌的活化能。无论磁性如何,在HMF下的成核频率高于没有HMF的成核频率。此外,在HMF下的过冷度的增加主要归因于接触角的增加,通过冷却速率和过冷度之间的函数关系计算。这一结果与纯铝和纯锌的计算形核功的增加是一致的。此外,由HMF引起的过冷度的增加部分归因于磁场诱导的过冷熔体中的热对流的抑制。
The influence of a high magnetic field (HMF) on the nucleation kinetics of paramagnetic aluminum and diamagnetic zinc melts has been investigated by differential thermal analysis (DTA). It is found that the application of an HMF increases the undercooling of pure aluminum and pure zinc at the same heatingcooling rates. Moreover, the quantitative analysis of activation energy calculated from the DTA results using the Kissinger method manifests that the HMF reduces the activation energy of pure aluminum and pure zinc. Regardless of magnetism, the nucleation frequency under an HMF is higher than that without an HMF. Furthermore, the increase in undercooling under the HMF is mainly attributed to the increase of the contact angle, calculated by the functional relationship between the cooling rate and undercooling. This result is consistent with the increase of the calculated nucleation work for pure aluminum and pure zinc. Additionally, the increase in undercooling caused by the HMF is partly ascribed to the magnetic field-induced suppression of thermal convection in the undercooled melt.
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发表时间: 2020-08
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