Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1574521 | Materials Science and Engineering: A | 2015 | 8 Pages |
Abstract
An age-hardenable Al-4Â wt% Cu alloy is severely deformed using high-pressure torsion (HPT) to refine the microstructure to an average gain size of ~210Â nm. High saturation hardness of 205Â Hv and high tensile strength of 820Â 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 353Â K. A peak hardness followed by softening appears within a few days after natural aging and within a few minutes after aging at 353Â 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.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Intan Fadhlina Mohamed, Yosuke Yonenaga, Seungwon Lee, Kaveh Edalati, Zenji Horita,