Projects per year
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.
Original language | English |
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Article number | 5099 |
Journal | Nature Communications |
Volume | 10 |
Online published | 8 Nov 2019 |
DOIs | |
Publication status | Published - 2019 |
Research Keywords
- BULK METALLIC GLASSES
- MOLECULAR-DYNAMICS
- CRYSTALLIZATION BEHAVIOR
- AL
- DEFORMATION
- SIZE
- NI
- TRANSITION
- COMPOSITES
- DUCTILITY
Publisher's Copyright Statement
- This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/
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Dive into the research topics of 'Hierarchical nanostructured aluminum alloy with ultrahigh strength and large plasticity'. Together they form a unique fingerprint.Projects
- 2 Finished
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GRF: Development of High Strength and High Ductility Micro-alloyed Gold by Inducing Gradient Nanostructures
LU, J. (Principal Investigator / Project Coordinator)
1/01/17 → 30/06/21
Project: Research
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CRF: Three-dimensional (3D) Atom Probe Facility for Characterization of Advanced Materials Research at Atomic- and Nano-scales
LIU, C. T. (Principal Investigator / Project Coordinator), LU, J. (Co-Principal Investigator), WANG, X.-L. (Co-Principal Investigator), WOO, C. H. (Co-Principal Investigator), YANG, Y. (Co-Principal Investigator), HUANG, M. (Co-Investigator), Li, Q. (Co-Investigator), Ngan, A. H. W. (Co-Investigator), Shi, S.-Q. (Co-Investigator) & Wang, N. (Co-Investigator)
1/05/15 → 26/10/18
Project: Research