Influence of processing temperature and die angle on the grain microstructure produced by severe deformation of an Al-7% Si alloy

被引:39
作者
Gutierrez-Urrutia, I. [1 ]
Munoz-Morris, M. A. [1 ]
Puertas, I. [2 ]
Luis, C. [2 ]
Morris, D. G. [1 ]
机构
[1] CSIC, CENIM, Dept Met Phys, Madrid 28040, Spain
[2] Univ Publ Navarra, Mech Energet & Mat Engn Dept, Pamplona 31006, Spain
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 475卷 / 1-2期
关键词
equal channel angular pressing (ECAP); mechanical properties; nanostructures; annealing;
D O I
10.1016/j.msea.2007.04.055
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Severe plastic deformation by equal-channel angular pressing has been carried out to high strains by repeated pressing using both a high-strain die and a moderate-strain die at both room temperature and at intermediate temperature. The die used appears to play no role in determining the saturation grain and dislocation microstructure after very high strains, with similar submicron grains, high dislocation densities, and silicon particle refinement observed. A slight tendency to microstructural non-uniformity is seen with the high-strain die. Severe plastic deformation at intermediate temperature leads to a coarser grain size, lower dislocation density, and precipitation of silicon from solution. The extent of grain coarsening, dislocation recovery and precipitate growth is much greater than when annealing room-temperature deformed material, since the high dislocation density accelerates precipitate formation and growth. Material strength is well described by the respective contributions of grain boundaries, dislocations, and precipitates. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:268 / 278
页数:11
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