Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 696, Issue -, Pages 400-406Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.04.095
Keywords
Grain boundary strengthening; Grain boundary doping; Nanocrystalline metals; Nanoindentation; Mechanical behavior
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Funding
- U.S. Army Research Office [W911NF-16-1-0369]
- National Science Foundation [DMR-1410941]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1410941] Funding Source: National Science Foundation
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Nanocrystalline Al-Mg alloys are used to isolate the effect of grain boundary doping on the strength of nanostructured metals. Mg is added during mechanical milling, followed by low homologous temperature annealing treatments to induce segregation without grain growth. Nanocrystalline Al-7 at% Mg that is annealed for 1 hat 200 degrees C is the strongest alloy fabricated, with a hardness of 4.56 GPa or approximately three times that of pure nanocrystalline Al. Micropillar compression experiments indicate a yield strength of 865 MPa and a specific strength of 329 IN m/kg, making this one of the strongest lightweight metals reported to date.
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