Mg segregations at and near deformation-distorted grain boundaries in ultrafine-grained Al-Mg alloys

被引：11
|
作者：
Ovid'ko, I. A. [1 ,2 ,3 ]
Sheinerman, A. G. [1 ,2 ,3 ]
Valiev, R. Z. [1 ,4 ]
机构：
[1] St Petersburg State Univ, Dept Math & Mech, St Petersburg 198504, Russia
[2] Russian Acad Sci, Inst Problems Mech Engn, St Petersburg 199178, Russia
[3] St Petersburg State Polytech Univ, St Petersburg 195251, Russia
[4] Ufa State Aviat Tech Univ, Ufa 450000, Russia
来源：
JOURNAL OF MATERIALS SCIENCE | 2014年 / 49卷 / 19期
关键词：
DISLOCATION;
D O I：
10.1007/s10853-014-8351-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The formation of Mg segregations at and near deformation-distorted grain boundaries (GBs) in ultrafine-grained Al-Mg alloys is theoretically described as a process enhanced by stress fields of extrinsic dislocations existing at such GBs. The equilibrium Mg concentration profiles near low-angle and high-angle GBs containing extrinsic dislocations are calculated. The results of the calculations explain the experimental observations (reported in the scientific literature) of spatially inhomogeneous Mg segregations characterized by high Mg concentrations at and near GBs in ultrafine-grained Al-Mg alloys processed by severe plastic deformation.
引用
收藏
页码：6682 / 6688
页数：7
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