Hierarchical nanostructured aluminum alloy with ultrahigh strength and large plasticity View Full Text


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Article Info

DATE

2019-11-08

AUTHORS

Ge Wu, Chang Liu, Ligang Sun, Qing Wang, Baoan Sun, Bin Han, Ji-Jung Kai, Junhua Luan, Chain Tsuan Liu, Ke Cao, Yang Lu, Lizi Cheng, Jian Lu

ABSTRACT

High strength and high ductility are often mutually exclusive properties for structural metallic materials. This is particularly important for aluminum (Al)-based alloys which are widely commercially employed. Here, we introduce a hierarchical nanostructured Al alloy with a structure of Al nanograins surrounded by nano-sized metallic glass (MG) shells. It achieves an ultrahigh yield strength of 1.2 GPa in tension (1.7 GPa in compression) along with 15% plasticity in tension (over 70% in compression). The nano-sized MG phase facilitates such ultrahigh strength by impeding dislocation gliding from one nanograin to another, while continuous generation-movement-annihilation of dislocations in the Al nanograins and the flow behavior of the nano-sized MG phase result in increased plasticity. This plastic deformation mechanism is also an efficient way to decrease grain size to sub-10 nm size for low melting temperature metals like Al, making this structural design one solution to the strength-plasticity trade-off. More... »

PAGES

5099

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1038/s41467-019-13087-4

    DOI

    http://dx.doi.org/10.1038/s41467-019-13087-4

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1122386409

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/31704930


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    27 schema:description High strength and high ductility are often mutually exclusive properties for structural metallic materials. This is particularly important for aluminum (Al)-based alloys which are widely commercially employed. Here, we introduce a hierarchical nanostructured Al alloy with a structure of Al nanograins surrounded by nano-sized metallic glass (MG) shells. It achieves an ultrahigh yield strength of 1.2 GPa in tension (1.7 GPa in compression) along with 15% plasticity in tension (over 70% in compression). The nano-sized MG phase facilitates such ultrahigh strength by impeding dislocation gliding from one nanograin to another, while continuous generation-movement-annihilation of dislocations in the Al nanograins and the flow behavior of the nano-sized MG phase result in increased plasticity. This plastic deformation mechanism is also an efficient way to decrease grain size to sub-10 nm size for low melting temperature metals like Al, making this structural design one solution to the strength-plasticity trade-off.
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