On the temperature-dependent diffusion growth of ϕ-Mg5Al2Zn2 ternary intermetallic compound in the Mg–Al–Zn system

The study on the temperature-dependent kinetic behavior of intermetallic compounds (IMCs) in Mg–Al–Zn (AZ) series alloy system is important since its close interrelation with the microstructure evolution under various alloying conditions as well as the T-dependent performance. However, there is a ve...

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Veröffentlicht in:Journal of materials science 2021-02, Vol.56 (4), p.3488-3497
Hauptverfasser: Cheng, Kaiming, Sun, Jiaxing, Xu, Huixia, Wang, Jin, Zhou, Jixue, Tang, Shouqiu, Wang, Xitao, Zhang, Lijun, Du, Yong
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container_issue 4
container_start_page 3488
container_title Journal of materials science
container_volume 56
creator Cheng, Kaiming
Sun, Jiaxing
Xu, Huixia
Wang, Jin
Zhou, Jixue
Tang, Shouqiu
Wang, Xitao
Zhang, Lijun
Du, Yong
description The study on the temperature-dependent kinetic behavior of intermetallic compounds (IMCs) in Mg–Al–Zn (AZ) series alloy system is important since its close interrelation with the microstructure evolution under various alloying conditions as well as the T-dependent performance. However, there is a very lack of experimental study on the diffusion kinetics of the ternary IMCs in the AZ series alloy systems. The current work combines the diffusion couple technique and numerical inverse method to investigate the T-dependent kinetic coefficients, i.e., the parabolic growth constant (PGC) and interdiffusion coefficients, for ϕ - Mg 5 Al 2 Zn 2 ternary IMC in the Mg–Al–Zn alloy system. The Arrhenius formula of both PGC and main interdiffusivities is obtained, i.e., ϕ k p = 5.48 × 10 - 5 exp 120010 RT m 2 /s, ϕ D ~ MgMg Al = 3.48 × 10 - 10 exp 50420 RT m 2 /s and ϕ D ~ ZnZn Al = 2.87 × 10 - 7 exp 91440 RT m 2 /s, based on which a numerical reproduction of the experimentally determined IMC growth is performed for verification. By comparing the current experimental and calculation results, the rate-controlling factor of the temperature-dependent diffusion growth of ϕ ternary IMC in the Mg–Al–Zn system is further discussed.
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However, there is a very lack of experimental study on the diffusion kinetics of the ternary IMCs in the AZ series alloy systems. The current work combines the diffusion couple technique and numerical inverse method to investigate the T-dependent kinetic coefficients, i.e., the parabolic growth constant (PGC) and interdiffusion coefficients, for ϕ - Mg 5 Al 2 Zn 2 ternary IMC in the Mg–Al–Zn alloy system. The Arrhenius formula of both PGC and main interdiffusivities is obtained, i.e., ϕ k p = 5.48 × 10 - 5 exp 120010 RT m 2 /s, ϕ D ~ MgMg Al = 3.48 × 10 - 10 exp 50420 RT m 2 /s and ϕ D ~ ZnZn Al = 2.87 × 10 - 7 exp 91440 RT m 2 /s, based on which a numerical reproduction of the experimentally determined IMC growth is performed for verification. 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subjects Alloy systems
Aluminum base alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Diffusion rate
Interdiffusion
Intermetallic compounds
Inverse method
Kinetic coefficients
Magnesium
Materials Science
Metals & Corrosion
Polymer Sciences
Solid Mechanics
Temperature dependence
Zinc
title On the temperature-dependent diffusion growth of ϕ-Mg5Al2Zn2 ternary intermetallic compound in the Mg–Al–Zn system
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