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Effect of isothermal aging on the microstructure and properties of as-cast Mg-Gd-Y-Zr alloy

Effect of isothermal aging on the microstructure and properties of as-cast Mg-Gd-Y-Zr alloy
Effect of isothermal aging on the microstructure and properties of as-cast Mg-Gd-Y-Zr alloy
The microstructure of Mg–7Gd–3Y–0.4Zr (wt.%) alloy during isothermal aging at 200 °C, 225 °C and 250 °C was investigated using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction. The mechanical properties of the peak-aged materials were evaluated by using Vickers hardness values, and their corrosion resistance was studied by using immersion tests, salt spray tests and electrochemical measurements in 5% NaCl solutions (wt.%). The results show that owing to the existence of a great many β′ precipitates with a quite small size and uniform distribution in the matrix, optimal mechanical properties and good corrosion resistance in 5% NaCl solutions are obtained when the alloy is aged at 200 °C for 120 h. The potentiodynamic polarization curves show that the corrosion current densities of the cathodic hydrogen evolution on the alloy peak-aged at 200 °C is lower than those for specimens of the alloy aged at 225 °C and 250 °C, which agrees fairly well with the microstructures of the alloys.
Mg-Gd-Y alloy, Microstructures, Age hardening, Corrosion
0921-5093
1589-1595
Liang, Shuquan
d95edd74-a2fa-447a-afad-1529ab254aee
Guan, Dikai
d20c4acc-342a-43fa-a204-7283f0cc33bf
Tan, Xiaoping
8c10279a-a072-439f-9eba-44772e7092dd
Chen, Liang
15459db0-4299-44b7-beaf-fb646add66ac
Tang, Yan
c187bb9c-4a92-4492-8ebe-21c55cd47209
Liang, Shuquan
d95edd74-a2fa-447a-afad-1529ab254aee
Guan, Dikai
d20c4acc-342a-43fa-a204-7283f0cc33bf
Tan, Xiaoping
8c10279a-a072-439f-9eba-44772e7092dd
Chen, Liang
15459db0-4299-44b7-beaf-fb646add66ac
Tang, Yan
c187bb9c-4a92-4492-8ebe-21c55cd47209

Liang, Shuquan, Guan, Dikai, Tan, Xiaoping, Chen, Liang and Tang, Yan (2011) Effect of isothermal aging on the microstructure and properties of as-cast Mg-Gd-Y-Zr alloy. Materials Science and Engineering: A, 528 (3), 1589-1595. (doi:10.1016/j.msea.2010.10.082).

Record type: Article

Abstract

The microstructure of Mg–7Gd–3Y–0.4Zr (wt.%) alloy during isothermal aging at 200 °C, 225 °C and 250 °C was investigated using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction. The mechanical properties of the peak-aged materials were evaluated by using Vickers hardness values, and their corrosion resistance was studied by using immersion tests, salt spray tests and electrochemical measurements in 5% NaCl solutions (wt.%). The results show that owing to the existence of a great many β′ precipitates with a quite small size and uniform distribution in the matrix, optimal mechanical properties and good corrosion resistance in 5% NaCl solutions are obtained when the alloy is aged at 200 °C for 120 h. The potentiodynamic polarization curves show that the corrosion current densities of the cathodic hydrogen evolution on the alloy peak-aged at 200 °C is lower than those for specimens of the alloy aged at 225 °C and 250 °C, which agrees fairly well with the microstructures of the alloys.

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More information

Published date: 25 January 2011
Keywords: Mg-Gd-Y alloy, Microstructures, Age hardening, Corrosion

Identifiers

Local EPrints ID: 475000
URI: http://eprints.soton.ac.uk/id/eprint/475000
ISSN: 0921-5093
PURE UUID: d3c72dc3-b074-4b92-95e4-c92b6f6cf452
ORCID for Dikai Guan: ORCID iD orcid.org/0000-0002-3953-2878

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Date deposited: 08 Mar 2023 17:53
Last modified: 17 Mar 2024 04:17

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Contributors

Author: Shuquan Liang
Author: Dikai Guan ORCID iD
Author: Xiaoping Tan
Author: Liang Chen
Author: Yan Tang

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