Thermodynamic stability of binary nanocrystalline alloys: analysis of solute and excess vacancy

被引：10
|
作者：
Gong, M. M. [1 ]
Liu, F. [1 ]
Zhang, K. [1 ]
机构：
[1] NW Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2011年 / 105卷 / 04期
关键词：
GRAIN-GROWTH; ATOMIC-STRUCTURE; STABILIZATION; SEGREGATION; KINETICS; FE; BOUNDARIES;
D O I：
10.1007/s00339-011-6501-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Regarding that the excess volume in grain boundaries (GBs) is released as the vacancies which are accommodated by the crystal bulk during grain growth, a free-energy function for binary nanocrystalline solid solution is proposed, based on the pairwise nearest-neighbor interactions. The model, for the given composition and temperature, predicts an equilibrium grain size, subjected to a mixed effect due to solute segregation and due to excess vacancies. Furthermore, excess-vacancy-inhibited grain coarsening can be attained, which plays a minor role in holding the thermal stability of nanocrystalline alloys, as compared to the effect of solute segregation.
引用
收藏
页码：927 / 934
页数：8
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