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Metals 2019, 9(2), 140; https://doi.org/10.3390/met9020140

Strengthening Al-Zn-Mg Alloys via Ultra-Fine Lamella Structures Containing a High Density of Dislocations and Clusters

1
,
1
,
1,*
and
1,2,3,*
1
Materials Characterization & Research Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
3
Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
*
Authors to whom correspondence should be addressed.
Received: 15 December 2018 / Revised: 13 January 2019 / Accepted: 24 January 2019 / Published: 28 January 2019
(This article belongs to the Special Issue The Behaviours of Alloys under Thermo-Mechanical Treatment)
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Abstract

A new method of thermo-mechanical processing has been designed by introducing pre-aging before general cold rolling for an Al-Zn-Mg alloy. This process results in an increase of 200 MPa in yield strength compared to that of the peak-aged samples. The microstructures were examined by transmission electron microscope and X-ray diffraction. It has been found that the enhanced strength is mainly contributed to by ultra-fine lamella structures containing a high density of dislocations pinned by nanoprecipitates. Extra strength is provided by the “interlocking” of precipitates and dislocations. Fractographic features analysis shows that crack propagation along the interface of the lamella structures is the direct reason for resulting in fracture, due to intra-granular strength exceeding grain boundary cohesion. View Full-Text
Keywords: Al-Zn-Mg alloy; UFG; lamella structure; thermo-mechanical processing; dislocation; precipitate Al-Zn-Mg alloy; UFG; lamella structure; thermo-mechanical processing; dislocation; precipitate
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Qin, Y.; Lin, S.; Jin, S.; Liu, J. Strengthening Al-Zn-Mg Alloys via Ultra-Fine Lamella Structures Containing a High Density of Dislocations and Clusters. Metals 2019, 9, 140.

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