Hierarchical nanostructured aluminum alloy with ultrahigh strength and large plasticity

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Article number5099
Journal / PublicationNature Communications
Volume10
Online published8 Nov 2019
Publication statusPublished - 2019

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.

Research Area(s)

  • BULK METALLIC GLASSES, MOLECULAR-DYNAMICS, CRYSTALLIZATION BEHAVIOR, AL, DEFORMATION, SIZE, NI, TRANSITION, COMPOSITES, DUCTILITY

Citation Format(s)

Hierarchical nanostructured aluminum alloy with ultrahigh strength and large plasticity. / Wu, Ge; Liu, Chang; Sun, Ligang; Wang, Qing; Sun, Baoan; Han, Bin; Kai, Ji-Jung; Luan, Junhua; Liu, Chain Tsuan; Cao, Ke; Lu, Yang; Cheng, Lizi; Lu, Jian.

In: Nature Communications, Vol. 10, 5099, 2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review