Influence of the grain size and structural state of grain boundaries on the parameter of low-temperature and high-rate superplasticity of nanocrystalline and microcrystalline alloys

被引：10
|
作者：
Chuvil'deev, V. N. [1 ]
Shchavleva, A. V. [1 ]
Nokhrin, A. V. [1 ]
Pirozhnikova, O. E. [1 ,2 ]
Gryaznov, M. Yu. [1 ,2 ]
Lopatin, Yu. G. [1 ]
Sysoev, A. N. [1 ]
Melekhin, N. V. [1 ]
Sakharov, N. V. [1 ]
Kopylov, V. I. [3 ]
Myshlyaev, M. M. [4 ,5 ]
机构：
[1] Lobachevsky Nizhni Novgorod State Univ, Sci Res Phys Tech Inst, Nizhnii Novgorod 603600, Russia
[2] Russian Acad Sci, AA Blagonravov Mech Engn Inst, Nizhni Novgorod Branch, Nizhnii Novgorod 603024, Russia
[3] Natl Acad Sci Belarus, Phys Tech Inst, Minsk 220141, BELARUS
[4] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Moscow Oblast, Russia
[5] Russian Acad Sci, Baikov Inst Met & Mat Sci, Moscow 119991, Russia
来源：
PHYSICS OF THE SOLID STATE | 2010年 / 52卷 / 05期
基金：
俄罗斯基础研究基金会;
关键词：
MECHANICAL-PROPERTIES; MAGNESIUM ALLOY;
D O I：
10.1134/S1063783410050422
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
A model has been proposed for calculating the grain size optimum for the deformation of nanocrystalline and microcrystalline materials under superplasticity conditions. The model is based on the concepts of the theory of nonequilibrium grain boundaries in metals. It has been demonstrated that the optimum grain size d (opt) can be calculated as the size at which a high level of nonequilibrium of grain boundaries is combined with a high intensity of the accommodation of grain boundary sliding. The dependences of the quantity d (opt) on the rate and temperature of the strain and the thermodynamic parameters of the material have been derived. The results obtained have been compared with the experimental data on the superplasticity of nanocrystalline and microcrystalline aluminum and magnesium alloys.
引用
收藏
页码：1098 / 1106
页数：9
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