Precipitation in an Al-Mg-Cu alloy and the effect of a low amount of Ag

被引：36
|
作者：
Mihara, Mami [1 ]
Marioara, Calin D. [2 ]
Andersen, Sigmund J. [2 ]
Holmestad, Randi [3 ]
Kobayashi, Equo [1 ]
Sato, Tatsuo [4 ]
机构：
[1] Tokyo Inst Technol, Dept Met & Ceram Sci, Tokyo 1528552, Japan
[2] SINTEF Mat & Chem, N-7465 Trondheim, Norway
[3] Norwegian Univ Sci & Technol, Fac Phys, N-7491 Trondheim, Norway
[4] Tokyo Inst Technol, Precis & Intelligence Lab, Yokohama, Kanagawa 2268503, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 658卷
关键词：
Aluminium alloys; Precipitation; Age-hardening; Micro-alloying; Transmission electron microscopy (TEM); High angle annular dark field (HAADF); S-PHASE; HARDENING RESPONSE; CRYSTAL-STRUCTURE; PARTICLES;
D O I：
10.1016/j.msea.2016.01.087
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Two high-purity aluminium alloys based on composition Al-3.0Mg-1.0Cu (wt%), one with added 0.4 wt% Ag, were compared up to 11 days ageing at 443 K by means of transmission electron microscopy and hardness measurements. The base alloy exhibits an inhomogeneous precipitate microstructure with a high density of fine needle-shaped Guinier-Preston-Bagaryatsky (GPB) zones together with coarser precipitates of S'-Al2CuMg and rods of the structurally unknown Z-phase. The S' phase is preferably formed on dislocations. The addition of Ag has a strong effect, leading to a homogeneous distribution with fine Ag-containing icosahedral quasi-crystalline precipitates (iQC). Both the GPB zones in the base alloy and the iQC phase in the Ag added alloy survive even after long term ageing. Ag is found to suppress the formation of the S' phase. It is suggested that the Z phase is an approximation phase to the quasi crystalline phase as is the case for the T-phase, implying they are based on similar (Bergman) clusters. (C) 2016 Elsevier B.V. All rights reserved.
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收藏
页码：91 / 98
页数：8
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