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

Kunihiro Ohashi; Takeshi Fujita; Kenji Kaneko; Zenji Horita; Terence G. Langdon

doi:10.1016/j.msea.2006.08.024

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

Kunihiro Ohashi, Takeshi Fujita, Kenji Kaneko, Zenji Horita, Terence G. Langdon

Advanced Institute for Materials Research (AIMR)

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

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 γ′-phase particles form within the grains and stable γ-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 γ-phase particles on the grain boundaries and a fine dispersion of η-zones and plate-like γ′-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.

Original language	English
Pages (from-to)	240-247
Number of pages	8
Journal	Materials Science and Engineering A
Volume	437
Issue number	2
DOIs	https://doi.org/10.1016/j.msea.2006.08.024
Publication status	Published - 2006 Nov 15

Keywords

Aging
Aluminium alloys
Equal-channel angular pressing
Metastable phases
Precipitation

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "The aging characteristics of an Al-Ag alloy processed by equal-channel angular pressing",

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 γ′-phase particles form within the grains and stable γ-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 γ-phase particles on the grain boundaries and a fine dispersion of η-zones and plate-like γ′-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.",

keywords = "Aging, Aluminium alloys, Equal-channel angular pressing, Metastable phases, Precipitation",

author = "Kunihiro Ohashi and Takeshi Fujita and Kenji Kaneko and Zenji Horita and Langdon, {Terence G.}",

note = "Funding Information: This work was supported in part by the Light Metals Educational Foundation of Japan, in part by a grant-in-aid for scientific research from the Ministry of Education, Science, Sports and Culture of Japan and in part by the National Science Foundation of the United States under grant no. DMR-0243331.",

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AU - Ohashi, Kunihiro

AU - Fujita, Takeshi

AU - Kaneko, Kenji

AU - Horita, Zenji

AU - Langdon, Terence G.

N1 - Funding Information: This work was supported in part by the Light Metals Educational Foundation of Japan, in part by a grant-in-aid for scientific research from the Ministry of Education, Science, Sports and Culture of Japan and in part by the National Science Foundation of the United States under grant no. DMR-0243331.

PY - 2006/11/15

Y1 - 2006/11/15

N2 - 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 γ′-phase particles form within the grains and stable γ-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 γ-phase particles on the grain boundaries and a fine dispersion of η-zones and plate-like γ′-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.

AB - 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 γ′-phase particles form within the grains and stable γ-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 γ-phase particles on the grain boundaries and a fine dispersion of η-zones and plate-like γ′-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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