Structure and mechanical properties of aging Al-Li-Cu-Zr-Sc-Ag alloy after severe plastic deformation by high-pressure torsion

被引：12
作者：
Kaigorodova, L. I. [1 ]
Rasposienko, D. Yu. [1 ]
Pushin, V. G. [1 ]
Pilyugin, V. P. [1 ]
Smirnov, S. V. [2 ]
机构：
[1] Russian Acad Sci, Inst Met Phys, Ural Branch, Ekaterinburg 620990, Russia
[2] Russian Acad Sci, Inst Machine Sci, Ural Branch, Ekaterinburg 620049, Russia
来源：
PHYSICS OF METALS AND METALLOGRAPHY | 2015年 / 116卷 / 04期
基金：
俄罗斯基础研究基金会;
关键词：
severe plastic deformation; high-pressure torsion; aging; recrystallization; supersaturated solid solution decomposition; nanocrystalline structure; boundaries; phase; grain dislocations; vacancies; microhardness; STABILITY; BEHAVIOR; PHASE;
D O I：
10.1134/S0031918X15040080
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The structural and phase transformations have been studied in aging commercial aluminum-lithium alloy Al-1.2 Li-3.2 Cu-0.09 Zr-0.11 Sc-0.4 Ag-0.3 Mg in the as-delivered state and after severe plastic deformation by torsion for 1, 5 and 10 revolutions under a high pressure of 4 GPa. Deformation-induced nanofragmentation and dynamic recrystallization have been found to occur in the alloy. The degree of recrystallization increases with deformation. Nanofragmentation and recrystallization processes are accompanied by the deformation-induced decomposition of solid solution and changes in both the nucleation mechanism of precipitation and the phase composition of the alloy. The influence of a nanostructured nanophase state of the alloy on its mechanical properties (microhardness, plasticity, elastic modulus, and stiffness) is discussed.
引用
收藏
页码：346 / 355
页数：10
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