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

An age-hardenable Al–4wt% Cu alloy is severely deformed using high-pressure torsion (HPT) to refine the microstructure to an average gain size of ~210nm. High saturation hardness of 205Hv and high tensile strength of 820MPa are achieved after the HPT processing. It is shown that the strength of the...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2015-03, Vol.627, p.111-118
Main Authors: Mohamed, Intan Fadhlina, Yonenaga, Yosuke, Lee, Seungwon, Edalati, Kaveh, Horita, Zenji
Format: Article
Language:English
Subjects:
Age hardening
Aging (artificial)
Aging (natural)
AGING MECHANISMS
Aluminum alloys
ALUMINUM ALLOYS (50 TO 99 AL)
Aluminum base alloys
COPPER ALUMINUM ALLOYS
HARDNESS
HIGH PRESSURE
High-pressure torsion (HPT)
Microstructure
MICROSTRUCTURES
Precipitation hardening
PRECIPITATION HARDENING MECHANISMS
Severe plastic deformation (SPD)
Strengthening
THERMAL STABILITY
Torsion
Ultrafine-grained materials (UFG)
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Summary:An age-hardenable Al–4wt% Cu alloy is severely deformed using high-pressure torsion (HPT) to refine the microstructure to an average gain size of ~210nm. High saturation hardness of 205Hv and high tensile strength of 820MPa 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 353K. A peak hardness followed by softening appears within a few days after natural aging and within a few minutes after aging at 353K, 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.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2014.12.117