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首页> 外文期刊>Scripta materialia >SIMULATION THE FCC->FCC+L1_2+DO_(22) KINETIC REACTION
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SIMULATION THE FCC->FCC+L1_2+DO_(22) KINETIC REACTION

机译：模拟FCC-> FCC + L1_2 + DO_（22）动力学反应

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摘要

Monte Carlo simulation of the kinetic in a three-phase alloy Ni-6.6at. percent.Al-15.lat. percent V at 800 deg C has shown that precipitation of the L1_2 and the DO_(22) phases from the FCC solid solution takes place in three stages. In the first stage, only {001} and {01(1/2)} short range ordering is observed. Some small Al-enriched and {001} ordered zones appear in the second stage. These L1_2 nuclei the size of which does not exceed 5 unit cells, do not have the equilibrium composition of the L1_2 phase. Compositional changes of V take place in the last stage. The composition of the L1_2 zones tends toward the equilibrium composition and the DO_(22) phase appears. {001} and {01(1/2)} long range order develop in the solute rich regions. The equilibrium L1_2 and DO_(22) phases develop. These results are in agreement with simulations of Poduri and Chen (11). In contrast to the mean field simulations without Langevin noise of Poduri and Chen, we were able to simulate the early stage of short range ordering of the solid solution.
机译：三相合金Ni-6.6at动力学的蒙特卡罗模拟。 Al-15.lat。在800摄氏度时，5％的V已表明，从FCC固溶体中析出L1_2和DO_（22）相的过程分为三个阶段。在第一阶段，仅观察到{001}和{01（1/2）}短程排序。在第二阶段中会出现一些小的富含Al的区域和{001}有序区域。这些L1_2核的大小不超过5个晶胞，不具有L1_2相的平衡组成。 V的组成变化发生在最后阶段。 L1_2区域的组成趋向于平衡组成，并出现DO_（22）相。 {001}和{01（1/2）}的远距离有序在富溶质区域发展。形成平衡L1_2和DO_（22）相。这些结果与Poduri和Chen（11）的模拟结果一致。与没有Poduri和Chen的Langevin噪声的平均场模拟相反，我们能够模拟固溶体短程有序的早期阶段。

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