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Peculiarities of the initial transient process of binary melt crystallization

机译:二元熔体结晶初始瞬态过程的特殊性

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The time dependence of the crystallization rate V(t) in the transient process that occurs during crystal pulling into a cold zone at a constant rate W has been investigated within the one-dimensional time-dependent model of binary melt solidification using numerical and analytical approaches. It is shown that the character of the dependence V(t) in this process is mainly determined by the parameter B _w = V _c /W, where V _c is the crystallization rate at which the constitutional supercooling zone is formed in the melt. At B _w ≥ 1, the function V(t) monotonically approaches its steady-state value W, while at B _w < 1 V(t) is generally nonmonotonic. The nonmonotonic character of V(t) can manifest itself both as aperiodic damping and in the form of damping oscillations. At B _w ~ 0.1, the vibrational amplitude of the crystallization rate in the initial transient process may reach several tens of a percent of W.
机译:在二元熔体凝固的一维时间相关模型中,使用数值和分析方法研究了在以恒定速率W拉入冷区的晶体中发生的瞬态过程中结晶速率V(t)的时间依赖性。 。结果表明,该过程中的依赖性V(t)的特征主要由参数B _w = V _c / W确定,其中V _c是在熔体中形成结构性过冷区的结晶速率。在B _w≥1时,函数V(t)单调接近其稳态值W,而在B _w <1时,V(t)通常是非单调的。 V(t)的非单调性既可以表现为非周期性阻尼,也可以表现为阻尼振荡。在B _w〜0.1时,初始瞬态过程中结晶速率的振动幅度可能达到W的百分之几十。

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