The aging characteristics of an Al-Ag alloy processed by equal-channel angular pressing

被引：27
作者：
Ohashi, Kunihiro
Fujita, Takeshi
Kaneko, Kenji
Horita, Zenji [1 ]
Langdon, Terence G.
机构：
[1] Kyushu Univ, Fac Engn, Dept Mat Sci & Engn, Fukuoka 8128581, Japan
[2] Tohoku Univ, Mat Res Inst, IFCAM, Sendai, Miyagi 9808577, Japan
[3] Univ So Calif, Dept Aeronaut & Mech Engn, Los Angeles, CA 90089 USA
[4] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 437卷 / 02期
基金：
美国国家科学基金会;
关键词：
aging; aluminium alloys; equal-channel angular pressing; precipitation; metastable phases;
D O I：
10.1016/j.msea.2006.08.024
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
An Al-10.8 wt.% Ag alloy was processed by equal-channel angular pressing (ECAP) and aged at temperatures of 373 or 473 K. Hardness measurements were taken after different aging times and the results show the hardness continuously decreases when aging at 473 K but increases to a peak hardness when aging at 373 K. For aging at 473 K, it is shown that metastable gamma'-phase particles form within the grains and stable gamma-phase particles form throughout the sample but these particles make no contribution to the hardness. By contrast, aging at 373 K leads to the formation of stable gamma-phase particles on the grain boundaries and a fine dispersion of eta-zones and plate-like gamma'-phase particles within the grains: the increase in hardness is attributed to these finely-dispersed particles. Aging at 373 K for 100 h, corresponding to peak aging, gives an increase in the uniform elongation in tensile testing and the same high level of stress as in samples after ECAP processing, (c) 2006 Elsevier B.V. All rights reserved.
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页码：240 / 247
页数：8
相关论文
共 41 条
[1]  
AUER H, 1965, Z METALLKD, V56, P240
[2]   Influence of severe plastic deformations on secondary phase precipitation in a 6082 Al-Mg-Si alloy [J].
Cabibbo, M ;
Evangelista, E ;
Vedani, M .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2005, 36A (05) :1353-1364
[3]   The shearing characteristics associated with equal-channel angular pressing [J].
Furukawa, M ;
Iwahashi, Y ;
Horita, Z ;
Nemoto, M ;
Langdon, TG .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1998, 257 (02) :328-332
[4]   Microhardness measurements and the Hall-Petch relationship in an Al-Mg alloy with submicrometer grain size [J].
Furukawa, M ;
Horita, Z ;
Nemoto, M ;
Valiev, RZ ;
Langdon, TG .
ACTA MATERIALIA, 1996, 44 (11) :4619-4629
[5]   Structural evolution and the Hall-Petch relationship in an Al-Mg-Li-Zr alloy with ultra-fine grain size [J].
Furukawa, M ;
Iwahashi, Y ;
Horita, Z ;
Nemoto, M ;
Tsenev, NK ;
Valiev, RZ ;
Langdon, TG .
ACTA MATERIALIA, 1997, 45 (11) :4751-4757
[6]   Microstructural evolution in a spray-cast aluminum alloy during equal-channel angular pressing [J].
Gao, N ;
Starink, MJ ;
Furukawa, M ;
Horita, Z ;
Xu, C ;
Langdon, TG .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 410 :303-307
[7]   THE DEFORMATION AND AGEING OF MILD STEEL .3. DISCUSSION OF RESULTS [J].
HALL, EO .
PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON SECTION B, 1951, 64 (381) :747-753
[8]   Equal-channel angular pressing of commercial aluminum alloys: Grain refinement, thermal stability and tensile properties [J].
Horita, Z ;
Fujinami, T ;
Nemoto, M ;
Langdon, TG .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2000, 31 (03) :691-701
[9]   Achieving high strength and high ductility in precipitation-hardened alloys [J].
Horita, Z ;
Ohashi, K ;
Fujita, T ;
Kaneko, K ;
Langdon, TG .
ADVANCED MATERIALS, 2005, 17 (13) :1599-+
[10]   Principle of equal-channel angular pressing for the processing of ultra-fine grained materials [J].
Iwahashi, Y ;
Wang, JT ;
Horita, Z ;
Nemoto, M ;
Langdon, TG .
SCRIPTA MATERIALIA, 1996, 35 (02) :143-146
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