Understanding the kinetic anisotropy of the soft-sphere bcc crystal–melt interfaces

Understanding the kinetic anisotropy of the soft-sphere bcc crystal–melt interfaces
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了解软球 bcc 晶体与熔体界面的动力学各向异性

DOI:
10.1088/1361-648x/ac6647
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发表时间:
2022-04
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
Y. Yang
Y. Yang
中科院分区:
其他
文献类型:
--
作者:
Y. S. Wang;Z. Liang;X. Zhang;W. L. Lu;Z. Y. Yu;X. M. Ma;H. T. Liang;Y. Yang

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抽象的。采用非平衡分子动力学(MD)模拟和含时Ginzburg-Landau(TDGL)凝固动力学理论,预测了用反幂排斥势模拟的软球的(100)、(110)和(111)CMI的动力学系数,并与文献报道的bcc Fe系统的动力学系数进行了比较。我们证实了BCC CMI系统(密度波幅)Ginzburg-Landau序参数平方梯度的空间积分的普适行为。体心立方软球和体心立方Fe CMI体系动力学各向异性的TDGL预测是一致的;两者都与软球系统的MD测量很好地吻合,但与Fe系统的MD测量有很大的不同。这一发现表明,目前的TDGL理论反映了由于界面颗粒堆积引起的一般各向异性关系的倾向,但缺乏解决由于颗粒-颗粒相互作用引起的动力学各向异性的特殊性的贡献参数。提出了界面熔体相密度弛豫时间各向异性和与材料有关的假设。
Abstract. By employing the non-equilibrium molecular dynamics (MD) simulations and the time-dependent Ginzburg–Landau (TDGL) theory for the solidification kinetics, we predict the kinetic coefficients for the bcc(100), (110), and (111) CMIs of the soft-spheres, which are modeled with the inverse-power repulsive potential, and compare with the previous reported data of the bcc Fe system. We confirm a universal-like behavior of the spatial integrations of the (density wave amplitudes) Ginzburg–Landau order parameter square-gradient for the bcc CMI systems. The TDGL predictions of the kinetic anisotropies for bcc soft-sphere and bcc Fe CMI systems are identical; both agree well with the MD measurement for the soft-sphere system but differ strongly with the MD measurement for the Fe system. This finding implies that the current TDGL theory reflects a preference of presenting the generic anisotropy relationship due to the interfacial particle packings but lacks the contribution parameter which addresses the specificities in the kinetic anisotropies owing to the particle–particle interactions. A hypothesis that the density relaxation times for the interface melt phases to be anisotropic and material-dependent is then proposed.
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