Effect of volume fraction of LPSO phases on corrosion and mechanical properties of Mg-Zn-Y alloys

Li, C, Xu, D, Zeng, Z, Wang, B, Sheng, L, Chen, X and Han, E 2017, 'Effect of volume fraction of LPSO phases on corrosion and mechanical properties of Mg-Zn-Y alloys', Materials and Design, vol. 121, pp. 430-441.


Document type: Journal Article
Collection: Journal Articles

Title Effect of volume fraction of LPSO phases on corrosion and mechanical properties of Mg-Zn-Y alloys
Author(s) Li, C
Xu, D
Zeng, Z
Wang, B
Sheng, L
Chen, X
Han, E
Year 2017
Journal name Materials and Design
Volume number 121
Start page 430
End page 441
Total pages 12
Publisher Elsevier
Abstract Microstructural evolution, corrosion behavior and mechanical properties of cast Mg-Zn-Y alloys as a function of volume fraction of long period stacking ordered (LPSO) phases were investigated. Results revealed that 18R-LPSO phase was formed in Mg-0.9%Zn-1.6%Y (ZW12), Mg-2.1%Zn-5.2%Y (ZW25) and Mg-3.1%Zn-7.6%Y (ZW38) alloys. LPSO phases in these alloys acted as micro-cathode to accelerate corrosion progress due to their nobler nature than that of α-Mg matrix. The galvanic-couple effect between LPSO phases and α-Mg matrix dominated the corrosion rate of the cast Mg-Zn-Y alloys in the long-term corrosion process. As a result, ZW12 alloy displayed the best corrosion resistance due to the least volume fraction of micro-cathodes (i.e. LPSO phases). In addition, compared with ZW25 alloy, the compact and thick LPSO phases in ZW38 alloy hindered the corrosion progress to a small degree since it was not preferentially oriented against corrosion front. The shape of corrosion pits was correlated to the shape of Mg dendrites that was a result of the volume fraction and distribution of LPSO phases. LPSO phases could enhance mechanical strength, but the increment was slight when the volume fraction of LPSO phases reached up to 20.3%.
Subject Materials Engineering not elsewhere classified
Keyword(s) Corrosion
Electrochemical analysis
LPSO phases
Mechanical properties
Mg alloys
Copyright notice © 2017 Elsevier Ltd. All rights reserved.
ISSN 0264-1275
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