Thermal stability of Al3(Scx,Zr1-x)-dispersoids in extruded aluminium alloys

被引：59
|
作者：
Forbord, B. [1 ]
Hallem, H. [2 ,3 ]
Royset, J. [4 ]
Marthinsen, K. [2 ]
机构：
[1] SINTEF Mat & Chem, N-7465 Trondheim, Norway
[2] Norwegian Univ Sci & Technol, N-7491 Trondheim, Norway
[3] Raufoss Technol & Ind Management, N-2831 Raufoss, Norway
[4] Hydro Aluminium R&D Sunndal, N-6600 Sunndalsora, Norway
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 475卷 / 1-2期
关键词：
aluminium alloys; extrusion; zirconium; scandium; dispersoids; recrystallisation;
D O I：
10.1016/j.msea.2007.04.054
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In aluminium alloys the highest resistance against recrystallisation is obtained through combined additions of Sc and Zr. Upon annealing these elements form a high number density of homogeneously distributed and coherent Al-3(ScxZr1-x)-L1(2)-dispersoids, and the coarsening of these phases subsequently control the softening processes of recovery and recrystallisation. In this work the kinetics of Al-3(ScxZr1-x)-coarsening has been investigated during annealing of two precipitation annealed and extruded Al-(Mn)-Fe-Si-Sc-Zr-alloys at temperatures between 500 degrees C and 600 degrees C. A simple analysis based on widely used theories for volume diffusion controlled dispersoid coarsening (R-3(t)-R-0(3) alpha t) was used to identify the dominant mechanisms. It was found that coarsening in both alloys is controlled by volume diffusion of Zr, as activation energies, Q, of 285 +/- 31 kJ/mol and 250 +/- 43 kJ/moI were obtained, respectively. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：241 / 248
页数：8
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