Nucleation of Ni-Fe alloy near the spinodal

被引：10
|
作者：
Lue, Y. J. [1 ]
Chen, M. [1 ]
Yang, H. [1 ]
Yu, D. Q. [1 ]
机构：
[1] Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China
来源：
ACTA MATERIALIA | 2008年 / 56卷 / 15期
基金：
中国国家自然科学基金;
关键词：
nucleation and growth; spinodal decomposition; molecular dynamics simulations; Ni-Fe alloy;
D O I：
10.1016/j.actamat.2008.04.025
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In molecular dynamics simulations, "non-classical" nucleation around the spinodal in Fe-Ni alloys is observed by controlling the composition. With increasing Fe concentration, metastable body-centered cubic (bcc) clusters are formed during pre-crystallization under the influence of the spinodal, and then grow into face-centered cubic (fcc)-ordered critical nuclei. When the composition reaches 75 at.% Fe, this transformation is suppressed and the bcc, rather than fcc, symmetry dominates the structure of critical nuclei, a typical nucleation behavior near the spinodal. Further increase in the Fe concentration depresses nucleation below the spinodal temperature. As a consequence, two transient bcc phases characterized by high and low densities appear upon reaching the critical size. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights, reserved.
引用
收藏
页码：4022 / 4027
页数：6
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