Age hardening and thermal stability of Al-Cu alloy processed by high-pressure torsion

Intan Fadhlina Mohamed; Yosuke Yonenaga; Seungwon Lee; Kaveh Edalati; Zenji Horita

doi:10.1016/j.msea.2014.12.117

Age hardening and thermal stability of Al-Cu alloy processed by high-pressure torsion

Intan Fadhlina Mohamed^*, Yosuke Yonenaga, Seungwon Lee, Kaveh Edalati, Zenji Horita

^*Corresponding author for this work

Materials Design and Engineering

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

83 Scopus citations

Abstract

An age-hardenable Al-4. wt% Cu alloy is severely deformed using high-pressure torsion (HPT) to refine the microstructure to an average gain size of ~210. nm. High saturation hardness of 205. Hv and high tensile strength of 820. MPa are achieved after the HPT processing. It is shown that the strength of the HPT-processed alloy is further improved by natural aging at room temperature or by artificial aging at 353. K. A peak hardness followed by softening appears within a few days after natural aging and within a few minutes after aging at 353. K, suggesting the low thermal stability of the alloy. Quantitative evaluation of different strengthening mechanisms shows that the grain boundary hardening through the Hall-Petch relationship and the precipitation hardening through the Orowan relationship are dominant strengthening mechanisms.

Original language	English
Pages (from-to)	111-118
Number of pages	8
Journal	Materials Science and Engineering A
Volume	627
DOIs	https://doi.org/10.1016/j.msea.2014.12.117
State	Published - 2015/03/01

Keywords

Aluminum alloys
High-pressure torsion (HPT)
Precipitation hardening
Severe plastic deformation (SPD)
Ultrafine-grained materials (UFG)

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.msea.2014.12.117

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title = "Age hardening and thermal stability of Al-Cu alloy processed by high-pressure torsion",

abstract = "An age-hardenable Al-4. wt% Cu alloy is severely deformed using high-pressure torsion (HPT) to refine the microstructure to an average gain size of ~210. nm. High saturation hardness of 205. Hv and high tensile strength of 820. MPa are achieved after the HPT processing. It is shown that the strength of the HPT-processed alloy is further improved by natural aging at room temperature or by artificial aging at 353. K. A peak hardness followed by softening appears within a few days after natural aging and within a few minutes after aging at 353. K, suggesting the low thermal stability of the alloy. Quantitative evaluation of different strengthening mechanisms shows that the grain boundary hardening through the Hall-Petch relationship and the precipitation hardening through the Orowan relationship are dominant strengthening mechanisms.",

keywords = "Aluminum alloys, High-pressure torsion (HPT), Precipitation hardening, Severe plastic deformation (SPD), Ultrafine-grained materials (UFG)",

author = "Mohamed, {Intan Fadhlina} and Yosuke Yonenaga and Seungwon Lee and Kaveh Edalati and Zenji Horita",

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doi = "10.1016/j.msea.2014.12.117",

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T1 - Age hardening and thermal stability of Al-Cu alloy processed by high-pressure torsion

AU - Mohamed, Intan Fadhlina

AU - Yonenaga, Yosuke

AU - Lee, Seungwon

AU - Edalati, Kaveh

AU - Horita, Zenji

PY - 2015/3/1

Y1 - 2015/3/1

N2 - An age-hardenable Al-4. wt% Cu alloy is severely deformed using high-pressure torsion (HPT) to refine the microstructure to an average gain size of ~210. nm. High saturation hardness of 205. Hv and high tensile strength of 820. MPa are achieved after the HPT processing. It is shown that the strength of the HPT-processed alloy is further improved by natural aging at room temperature or by artificial aging at 353. K. A peak hardness followed by softening appears within a few days after natural aging and within a few minutes after aging at 353. K, suggesting the low thermal stability of the alloy. Quantitative evaluation of different strengthening mechanisms shows that the grain boundary hardening through the Hall-Petch relationship and the precipitation hardening through the Orowan relationship are dominant strengthening mechanisms.

AB - An age-hardenable Al-4. wt% Cu alloy is severely deformed using high-pressure torsion (HPT) to refine the microstructure to an average gain size of ~210. nm. High saturation hardness of 205. Hv and high tensile strength of 820. MPa are achieved after the HPT processing. It is shown that the strength of the HPT-processed alloy is further improved by natural aging at room temperature or by artificial aging at 353. K. A peak hardness followed by softening appears within a few days after natural aging and within a few minutes after aging at 353. K, suggesting the low thermal stability of the alloy. Quantitative evaluation of different strengthening mechanisms shows that the grain boundary hardening through the Hall-Petch relationship and the precipitation hardening through the Orowan relationship are dominant strengthening mechanisms.

KW - Aluminum alloys

KW - High-pressure torsion (HPT)

KW - Precipitation hardening

KW - Severe plastic deformation (SPD)

KW - Ultrafine-grained materials (UFG)

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VL - 627

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EP - 118

JO - Materials Science and Engineering A

JF - Materials Science and Engineering A

ER -

Age hardening and thermal stability of Al-Cu alloy processed by high-pressure torsion

Abstract

Keywords

ASJC Scopus subject areas

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