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

C. Q. Li, D. K. Xu, Z. R. Zeng, B. J. Wang, L. Y. Sheng, X.-B. Chen, E. H. Han

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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%.

Original languageEnglish
Pages (from-to)430-441
Number of pages12
JournalMaterials & Design
Volume121
DOIs
Publication statusPublished - 5 May 2017

Keywords

  • Corrosion
  • Electrochemical analysis
  • LPSO phases
  • Mechanical properties
  • Mg alloys

Cite this

Li, C. Q. ; Xu, D. K. ; Zeng, Z. R. ; Wang, B. J. ; Sheng, L. Y. ; Chen, X.-B. ; Han, E. H. / Effect of volume fraction of LPSO phases on corrosion and mechanical properties of Mg-Zn-Y alloys. In: Materials & Design. 2017 ; Vol. 121. pp. 430-441.
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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{\%}.",
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Effect of volume fraction of LPSO phases on corrosion and mechanical properties of Mg-Zn-Y alloys. / Li, C. Q.; Xu, D. K.; Zeng, Z. R.; Wang, B. J.; Sheng, L. Y.; Chen, X.-B.; Han, E. H.

In: Materials & Design, Vol. 121, 05.05.2017, p. 430-441.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Effect of volume fraction of LPSO phases on corrosion and mechanical properties of Mg-Zn-Y alloys

AU - Li, C. Q.

AU - Xu, D. K.

AU - Zeng, Z. R.

AU - Wang, B. J.

AU - Sheng, L. Y.

AU - Chen, X.-B.

AU - Han, E. H.

PY - 2017/5/5

Y1 - 2017/5/5

N2 - 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%.

AB - 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%.

KW - Corrosion

KW - Electrochemical analysis

KW - LPSO phases

KW - Mechanical properties

KW - Mg alloys

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DO - 10.1016/j.matdes.2017.02.078

M3 - Article

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EP - 441

JO - Materials & Design

JF - Materials & Design

SN - 0264-1275

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