期刊
SCIENCE
卷 363, 期 6430, 页码 972-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aav7086
关键词
-
资金
- Australian Government Research Training Program Scholarship
- Monash International Postgraduate Research Scholarship
- Monash Graduate Scholarship
- Australian Research Council [DP150101577, DE170100307]
- Australian Research Council [DE170100307] Funding Source: Australian Research Council
High-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 degrees to 200 degrees 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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