Effects of Cu and Zn on microstructures and mechanical behavior of the medium-entropy aluminum alloy

Bingbing Zhang; Peter K. Liaw; Jamieson Brechtl; Jingli Ren; Xiaoxiang Guo; Yong Zhang

doi:10.1016/j.jallcom.2019.153092

Effects of Cu and Zn on microstructures and mechanical behavior of the medium-entropy aluminum alloy

Bingbing Zhang, Peter K. Liaw, Jamieson Brechtl, Jingli Ren, Xiaoxiang Guo, Yong Zhang

Research output: Contribution to journal › Article › peer-review

51 Scopus citations

Abstract

Lightweight alloys are becoming more and more important. Based on the 5083 aluminum alloy, the effects of Zn and Cu additions on the microstructures, properties, and serration behavior were investigated. The results show that with the increase of the Zn content, the tensile and yield strengths of the alloy increase, while the elongation and the serration amplitude keep on decreasing. Moreover, different amounts of Cu are added to the high Zn content Al–Mg-6 wt.% (weight percent) Zn alloy, in which the strength and plasticity are improved firstly. When the Cu content was 6 wt%, the elongation of the alloy is about 7%, and the serration behavior of the alloy gradually disappears. The optimal mechanical property is achieved at the composition of Al–Mg-6wt.%Zn-6wt.%Cu. The serration behavior is believed to be related to the interaction between the moving dislocations and the precipitates. Furthermore, the serrated flow was analyzed using the refined composite multiscale entropy algorithm. It was found that the dynamical complexity of the serrations generally increased with an increase in the solute density, the stress-drop magnitude, the grain size, the tensile and yield strengths, and the degree of plasticity.

Original language	English
Article number	153092
Journal	Journal of Alloys and Compounds
Volume	820
DOIs	https://doi.org/10.1016/j.jallcom.2019.153092
State	Published - Apr 15 2020
Externally published	Yes

Funding

Zhang Y. would like to thank the financial support from the National Natural Science Foundation of China (NSFC, 51471025 and 51671020 ). PKL very much appreciates the support of the U.S. Army Research Office project ( W911NF-13-1-0438 and W911NF-19-2-0049 ) with the program managers, Drs. M. P. Bakas, S. N. Mathaudhu, and D. M. Stepp. PKL thanks the support from the National Science Foundation ( DMR-1611180 and 1809640 ) with the program directors, Drs. G. Shiflet and D. Farkas. Zhang Y. would like to thank the financial support from the National Natural Science Foundation of China (NSFC, 51471025 and 51671020). PKL very much appreciates the support of the U.S. Army Research Office project (W911NF-13-1-0438 and W911NF-19-2-0049) with the program managers, Drs. M. P. Bakas, S. N. Mathaudhu, and D. M. Stepp. PKL thanks the support from the National Science Foundation (DMR-1611180 and 1809640) with the program directors, Drs. G. Shiflet and D. Farkas.

Funders	Funder number
U.S. Army Research Office
U.S. Army Research Office project	W911NF-19-2-0049, W911NF-13-1-0438
National Science Foundation	DMR-1611180
Directorate for Mathematical and Physical Sciences	1809640
National Natural Science Foundation of China	51471025, 51671020
National Aerospace Science Foundation of China

Keywords

Al–Mg–Zn–Cu alloys
Medium-entropy alloys
Microstructure
Serration behavior
Tensile strength

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10.1016/j.jallcom.2019.153092

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title = "Effects of Cu and Zn on microstructures and mechanical behavior of the medium-entropy aluminum alloy",

abstract = "Lightweight alloys are becoming more and more important. Based on the 5083 aluminum alloy, the effects of Zn and Cu additions on the microstructures, properties, and serration behavior were investigated. The results show that with the increase of the Zn content, the tensile and yield strengths of the alloy increase, while the elongation and the serration amplitude keep on decreasing. Moreover, different amounts of Cu are added to the high Zn content Al–Mg-6 wt.% (weight percent) Zn alloy, in which the strength and plasticity are improved firstly. When the Cu content was 6 wt%, the elongation of the alloy is about 7%, and the serration behavior of the alloy gradually disappears. The optimal mechanical property is achieved at the composition of Al–Mg-6wt.%Zn-6wt.%Cu. The serration behavior is believed to be related to the interaction between the moving dislocations and the precipitates. Furthermore, the serrated flow was analyzed using the refined composite multiscale entropy algorithm. It was found that the dynamical complexity of the serrations generally increased with an increase in the solute density, the stress-drop magnitude, the grain size, the tensile and yield strengths, and the degree of plasticity.",

keywords = "Al–Mg–Zn–Cu alloys, Medium-entropy alloys, Microstructure, Serration behavior, Tensile strength",

author = "Bingbing Zhang and Liaw, {Peter K.} and Jamieson Brechtl and Jingli Ren and Xiaoxiang Guo and Yong Zhang",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2020",

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doi = "10.1016/j.jallcom.2019.153092",

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AU - Zhang, Bingbing

AU - Liaw, Peter K.

AU - Brechtl, Jamieson

AU - Ren, Jingli

AU - Guo, Xiaoxiang

AU - Zhang, Yong

PY - 2020/4/15

Y1 - 2020/4/15

N2 - Lightweight alloys are becoming more and more important. Based on the 5083 aluminum alloy, the effects of Zn and Cu additions on the microstructures, properties, and serration behavior were investigated. The results show that with the increase of the Zn content, the tensile and yield strengths of the alloy increase, while the elongation and the serration amplitude keep on decreasing. Moreover, different amounts of Cu are added to the high Zn content Al–Mg-6 wt.% (weight percent) Zn alloy, in which the strength and plasticity are improved firstly. When the Cu content was 6 wt%, the elongation of the alloy is about 7%, and the serration behavior of the alloy gradually disappears. The optimal mechanical property is achieved at the composition of Al–Mg-6wt.%Zn-6wt.%Cu. The serration behavior is believed to be related to the interaction between the moving dislocations and the precipitates. Furthermore, the serrated flow was analyzed using the refined composite multiscale entropy algorithm. It was found that the dynamical complexity of the serrations generally increased with an increase in the solute density, the stress-drop magnitude, the grain size, the tensile and yield strengths, and the degree of plasticity.

AB - Lightweight alloys are becoming more and more important. Based on the 5083 aluminum alloy, the effects of Zn and Cu additions on the microstructures, properties, and serration behavior were investigated. The results show that with the increase of the Zn content, the tensile and yield strengths of the alloy increase, while the elongation and the serration amplitude keep on decreasing. Moreover, different amounts of Cu are added to the high Zn content Al–Mg-6 wt.% (weight percent) Zn alloy, in which the strength and plasticity are improved firstly. When the Cu content was 6 wt%, the elongation of the alloy is about 7%, and the serration behavior of the alloy gradually disappears. The optimal mechanical property is achieved at the composition of Al–Mg-6wt.%Zn-6wt.%Cu. The serration behavior is believed to be related to the interaction between the moving dislocations and the precipitates. Furthermore, the serrated flow was analyzed using the refined composite multiscale entropy algorithm. It was found that the dynamical complexity of the serrations generally increased with an increase in the solute density, the stress-drop magnitude, the grain size, the tensile and yield strengths, and the degree of plasticity.

KW - Al–Mg–Zn–Cu alloys

KW - Medium-entropy alloys

KW - Microstructure

KW - Serration behavior

KW - Tensile strength

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Effects of Cu and Zn on microstructures and mechanical behavior of the medium-entropy aluminum alloy

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