The ageing characteristics of an Al-Ag alloy processed by equal-channel angular pressing
The ageing characteristics of an Al-Ag alloy processed by equal-channel angular pressing
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 ??-phase particles form within the grains and stable ?-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 ?-phase particles on the grain boundaries and a fine dispersion of ?-zones and plate-like ??-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.
aging, aluminium alloys, equal-channel angular pressing, precipitation, metastable phases
240-247
Ohashi, Kunihiro
672fc5e4-c9da-4f17-b6b6-b7dae56f0510
Fujita, Takeshi
f2d5a9fe-84e7-47c2-9e96-7ad57035c7e7
Kaneko, Kenji
59fbdb7b-cec8-4d21-a877-4a6c24084b63
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
2006
Ohashi, Kunihiro
672fc5e4-c9da-4f17-b6b6-b7dae56f0510
Fujita, Takeshi
f2d5a9fe-84e7-47c2-9e96-7ad57035c7e7
Kaneko, Kenji
59fbdb7b-cec8-4d21-a877-4a6c24084b63
Horita, Zenji
011521b8-3b29-494b-bf3f-346827ddbcce
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Ohashi, Kunihiro, Fujita, Takeshi, Kaneko, Kenji, Horita, Zenji and Langdon, Terence G.
(2006)
The ageing characteristics of an Al-Ag alloy processed by equal-channel angular pressing.
Materials Science and Engineering: A, 437 (2), .
(doi:10.1016/j.msea.2006.08.024).
Abstract
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 ??-phase particles form within the grains and stable ?-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 ?-phase particles on the grain boundaries and a fine dispersion of ?-zones and plate-like ??-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.
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Published date: 2006
Keywords:
aging, aluminium alloys, equal-channel angular pressing, precipitation, metastable phases
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 43708
URI: http://eprints.soton.ac.uk/id/eprint/43708
ISSN: 0921-5093
PURE UUID: 07d2c886-6f85-4645-bf31-6fe1b32f7636
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Date deposited: 29 Jan 2007
Last modified: 16 Mar 2024 03:28
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Contributors
Author:
Kunihiro Ohashi
Author:
Takeshi Fujita
Author:
Kenji Kaneko
Author:
Zenji Horita
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