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：

澳大利亚研究理事会; 美国国家科学基金会;

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

页码：4742 / 4749

页数：8

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