Microstructural evolution of Fe-rich particles in an Al-Zn-Mg-Cu alloy during equal-channel angular pressing

被引：40
|
作者：
Sha, G. [1 ,2 ]
Wang, Y. B. [3 ]
Liao, X. Z. [3 ]
Duan, Z. C. [4 ]
Ringer, S. P. [1 ,2 ]
Langdon, T. G. [4 ,5 ]
机构：
[1] Univ Sydney, Australian Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia
[2] Univ Sydney, ARC Ctr Excellence Design Light Met, Sydney, NSW 2006, Australia
[3] Univ Sydney, Sch Aerosp Mech & Mech Engn, Sydney, NSW 2006, Australia
[4] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA
[5] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton SO17 1BJ, Hants, England
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 527卷 / 18-19期
基金：
美国国家科学基金会; 澳大利亚研究理事会;
关键词：
Aluminium alloys; ECAP; Fe-rich intermetallics; TEM; 3DAP; INTERMETALLIC PHASES; PRECIPITATION; DIFFUSION; SOLIDIFICATION; ECAP;
D O I：
10.1016/j.msea.2010.04.041
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The microstructures of a severely deformed Al-Zn-Mg-Cu (AA7136) alloy have been characterized carefully using transmission electron microscopy and three-dimensional atom probe analysis. The Fe-rich intermetallic particles are predominantly Al13Fe4 type in the as-extruded alloy. Significantly, equal-channel angular pressing (ECAP) at 200 degrees C refines Fe-rich particles from similar to 1 to 2 mu m to as small as similar to 50 nm after 4 passes processing, and effectively narrow down their size distribution with the increase of number of ECAP passes. In addition, small Fe-rich particles evolve into spherical morphology and are in a more uniform distribution. The formations of Fe-rich phases in AA7136, the kinetic and thermodynamic effects in relation to the refinement of Fe-rich particles and their morphology evolution during ECAP processing are discussed. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：4742 / 4749
页数：8
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