Microstructure and mechanical properties of Al-7075 alloy processed by equal channel angular pressing combined with aging treatment

被引：152

作者：

Shaeri, M. H. ^{[1
]}

Salehi, M. T. ^{[1
]}

Seyyedein, S. H. ^{[1
]}

Abutalebi, M. R. ^{[1
]}

Park, J. K. ^{[2
]}

机构：

[1] Iran Univ Sci & Technol IUST, Dept Met & Mat Engn, Tehran 1684613114, Iran

[2] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea

来源：

MATERIALS & DESIGN | 2014年 / 57卷

关键词：

Equal channel angular pressing; Microstructure; Age hardening treatment; Strength; Microhardness; SEVERE PLASTIC-DEFORMATION; MG-CU ALLOY; AL-ALLOY; GRAIN-REFINEMENT; MAGNESIUM ALLOY; ALUMINUM-ALLOYS; ECAP; EXTRUSION; PRECIPITATION; HOMOGENEITY;

D O I：

10.1016/j.matdes.2014.01.008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to examine the combined effect of plastic deformation and aging process, the Al 7075 alloy was subjected to equal channel angular pressing (ECAP) deformation by route BC in various ECAP and aging conditions: pre-ECAP aging, post-ECAP aging and dynamic aging during ECAP at 393 K and 423 K. Followed by ECAP and aging treatment, Vickers microhardness and tensile test were performed and microstructural observations were undertaken using transmission electron microscopy (TEM) and X-ray diffractometer (XRD). TEM investigation showed that ultrafine-grained (UFG) materials with grain size less than 500 nm could be obtained after three or four passes of ECAP. Precipitates characterization revealed that maximum mechanical properties are achieved when the microstructure mainly consists of fine dispersion of small eta' precipitates and minor quantities of GP zones. Dynamic aged specimens at 393 K and 423 K represented maximum and minimum mechanical properties, respectively, due to formation of fine eta' precipitates plus GP zones and eta' plus eta precipitates, respectively. Dynamic aging during ECAP at 393 K appeared preferable to other procedures for attaining maximum mechanical properties as well as saving time and energy. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：250 / 257

页数：8

共 38 条

[1] Microstructural homogeneity, texture, tensile and shear behavior of AM60 magnesium alloy produced by extrusion and equal channel angular pressing [J].

Akbaripanah, F. ;

Fereshteh-Saniee, F. ;

Mahmudi, R. ;

Kim, H. K. .

MATERIALS & DESIGN, 2013, 43 :31-39

[2] Equal channel angular pressing die to extrude a variety of materials [J].

Balasundar, I. ;

Rao, M. Sudhakara ;

Raghu, T. .

MATERIALS & DESIGN, 2009, 30 (04) :1050-1059

[3] High Strength AA7050 Al alloy processed by ECAP: Microstructure and mechanical properties [J].

Cardoso, K. R. ;

Travessa, D. N. ;

Botta, W. J. ;

Jorge, A. M., Jr. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2011, 528 (18) :5804-5811

[4] Developing Processing Routes for the Equal-Channel Angular Pressing of Age-Hardenable Aluminum Alloys [J].

Duan, Zhi Chao ;

Chinh, Nguyen Q. ;

Xu, Cheng ;

Langdon, Terence G. .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2010, 41A (04) :802-809

[5] Characterisation of high pressure torsion processed 7150 Al-Zn-Mg-Cu alloy [J].

Ghosh, K. S. ;

Gao, N. ;

Starink, M. J. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2012, 552 :164-171

[6] AN ELECTRON MICROSCOPE INVESTIGATION OF MICROSTRUCTURE IN AN ALUMINUM-ZINC-MAGNESIUM ALLOY [J].

GJONNES, J ;

SIMENSEN, CJ .

ACTA METALLURGICA, 1970, 18 (08) :881-&

[7] The effect of severe plastic deformation on precipitation in supersaturated Al-Zn-Mg alloys [J].

Gubicza, J. ;

Schiller, I. ;

Chinh, N. Q. ;

Illy, J. ;

Horita, Z. ;

Langdon, T. G. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2007, 460 :77-85

[8] Improvement of mechanical properties for Al alloys using equal-channel angular pressing [J].

Horita, Z ;

Fujinami, T ;

Nemoto, M ;

Langdon, TG .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2001, 117 (03) :288-292

[9] The potential for scaling ECAP: effect of sample size on grain refinement and mechanical properties [J].

Horita, Z ;

Fujinami, T ;

Langdon, TG .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2001, 318 (1-2) :34-41

[10] Microstructure of the post-ECAP aging processed 6061 Al alloys [J].

Kim, W. J. ;

Wang, J. Y. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2007, 464 (1-2) :23-27

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