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Precipitation strengthening of aluminum alloys by room-temperature cyclic plasticity
journal contribution
posted on 2019-03-01, 00:00 authored by W Sun, Y Zhu, Ross MarceauRoss Marceau, L Wang, Q Zhang, X Gao, C HutchinsonHigh-strength aluminum alloys are important for lightweighting vehicles and are extensively used in aircraft and, increasingly, in automobiles. The highest-strength aluminum alloys require a series of high-temperature “bakes” (120° to 200°C) to form a high number density of nanoparticles by solid-state precipitation. We found that a controlled, room-temperature cyclic deformation is sufficient to continuously inject vacancies into the material and to mediate the dynamic precipitation of a very fine (1- to 2-nanometer) distribution of solute clusters. This results in better material strength and elongation properties relative to traditional thermal treatments, despite a much shorter processing time. The microstructures formed are much more uniform than those characteristic of traditional thermal treatments and do not exhibit precipitate-free zones. These alloys are therefore likely to be more resistant to damage.
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Journal
ScienceVolume
363Issue
6430Pagination
972 - 975Publisher
American Association for the Advancement of Science (AAAS)Location
Washington, D.C.Publisher DOI
ISSN
0036-8075eISSN
1095-9203Language
engPublication classification
C1 Refereed article in a scholarly journalUsage metrics
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