Nanocrystalline Al-Mg with extreme strength due to grain boundary doping

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:696

Article

Pun, Simon C.¹  Wang, Wenbo³  Khalajhedayati, Amirhossein²  Schuler, Jennifer D.²  Trelewicz, Jason R.³  Rupert, Timothy J.^1,2 

[1] Univ Calif Irvine, Dept Mech & Aerosp Engn, Irvine, CA 92697 USA

[2] Univ Calif Irvine, Dept Chem Engn & Mat Sci, Irvine, CA 92697 USA

[3] SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA

关键词: Grain boundary strengthening;    Grain boundary doping;    Nanocrystalline metals;    Nanoindentation;    Mechanical behavior;   

DOI  :  10.1016/j.msea.2017.04.095

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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