Enhanced age-hardening by synergistic strengthening from Mg–Si and Mg–Zn precipitates in Al-Mg-Si alloy with Zn addition

Wenchao Yang; Weiwei Shen; Ruirong Zhang; Kaili Cao; Jun Zhang; Lin Liu

doi:10.1016/j.matchar.2020.110579

Enhanced age-hardening by synergistic strengthening from Mg–Si and Mg–Zn precipitates in Al-Mg-Si alloy with Zn addition

Wenchao Yang, Weiwei Shen, Ruirong Zhang, Kaili Cao, Jun Zhang, Lin Liu

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

24 Scopus citations

Abstract

The accelerated age-hardening response and the enhanced peak-hardness in Al-Mg-Si with Zn addition were investigated by three-dimensional atom probe and transmission electron microscopy. The results showed that Zn addition significantly increased the number density of solute aggregates by stimulating the formation of more Mg–Si precipitates and resulted in a higher Mg/Si ratio because of the formation of Mg–Zn precipitates. Furthermore, a synergistic strengthening from Mg–Si and Mg–Zn solute aggregates was quantitatively estimated in accelerating the age-hardening response at the early aging stage, and a coexistence of β″ phases for Mg₂Si system and GPI zones/η′ phases for MgZn₂ system was confirmed to enhance the peak-hardness of Al-Mg-Si alloy with Zn addition.

Original language	English
Article number	110579
Journal	Materials Characterization
Volume	169
DOIs	https://doi.org/10.1016/j.matchar.2020.110579
State	Published - Nov 2020

Keywords

Age-hardening
Al-Mg-Si-Zn alloys
Cluster
Three-dimensional atom probe
Transmission Electron Microscopy

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10.1016/j.matchar.2020.110579

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title = "Enhanced age-hardening by synergistic strengthening from Mg–Si and Mg–Zn precipitates in Al-Mg-Si alloy with Zn addition",

abstract = "The accelerated age-hardening response and the enhanced peak-hardness in Al-Mg-Si with Zn addition were investigated by three-dimensional atom probe and transmission electron microscopy. The results showed that Zn addition significantly increased the number density of solute aggregates by stimulating the formation of more Mg–Si precipitates and resulted in a higher Mg/Si ratio because of the formation of Mg–Zn precipitates. Furthermore, a synergistic strengthening from Mg–Si and Mg–Zn solute aggregates was quantitatively estimated in accelerating the age-hardening response at the early aging stage, and a coexistence of β″ phases for Mg2Si system and GPI zones/η′ phases for MgZn2 system was confirmed to enhance the peak-hardness of Al-Mg-Si alloy with Zn addition.",

keywords = "Age-hardening, Al-Mg-Si-Zn alloys, Cluster, Three-dimensional atom probe, Transmission Electron Microscopy",

author = "Wenchao Yang and Weiwei Shen and Ruirong Zhang and Kaili Cao and Jun Zhang and Lin Liu",

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doi = "10.1016/j.matchar.2020.110579",

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journal = "Materials Characterization",

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TY - JOUR

T1 - Enhanced age-hardening by synergistic strengthening from Mg–Si and Mg–Zn precipitates in Al-Mg-Si alloy with Zn addition

AU - Yang, Wenchao

AU - Shen, Weiwei

AU - Zhang, Ruirong

AU - Cao, Kaili

AU - Zhang, Jun

AU - Liu, Lin

PY - 2020/11

Y1 - 2020/11

N2 - The accelerated age-hardening response and the enhanced peak-hardness in Al-Mg-Si with Zn addition were investigated by three-dimensional atom probe and transmission electron microscopy. The results showed that Zn addition significantly increased the number density of solute aggregates by stimulating the formation of more Mg–Si precipitates and resulted in a higher Mg/Si ratio because of the formation of Mg–Zn precipitates. Furthermore, a synergistic strengthening from Mg–Si and Mg–Zn solute aggregates was quantitatively estimated in accelerating the age-hardening response at the early aging stage, and a coexistence of β″ phases for Mg2Si system and GPI zones/η′ phases for MgZn2 system was confirmed to enhance the peak-hardness of Al-Mg-Si alloy with Zn addition.

AB - The accelerated age-hardening response and the enhanced peak-hardness in Al-Mg-Si with Zn addition were investigated by three-dimensional atom probe and transmission electron microscopy. The results showed that Zn addition significantly increased the number density of solute aggregates by stimulating the formation of more Mg–Si precipitates and resulted in a higher Mg/Si ratio because of the formation of Mg–Zn precipitates. Furthermore, a synergistic strengthening from Mg–Si and Mg–Zn solute aggregates was quantitatively estimated in accelerating the age-hardening response at the early aging stage, and a coexistence of β″ phases for Mg2Si system and GPI zones/η′ phases for MgZn2 system was confirmed to enhance the peak-hardness of Al-Mg-Si alloy with Zn addition.

KW - Age-hardening

KW - Al-Mg-Si-Zn alloys

KW - Cluster

KW - Three-dimensional atom probe

KW - Transmission Electron Microscopy

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DO - 10.1016/j.matchar.2020.110579

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JO - Materials Characterization

JF - Materials Characterization

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Enhanced age-hardening by synergistic strengthening from Mg–Si and Mg–Zn precipitates in Al-Mg-Si alloy with Zn addition

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Keywords

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