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

被引：169

作者：

Li, C. Q. ^{[1
,2
,3
]}

Xu, D. K. ^{[1
]}

Zeng, Z. R. ^{[3
]}

Wang, B. J. ^{[4
]}

Sheng, L. Y. ^{[5
]}

Chen, X. -B. ^{[3
]}

Han, E. H. ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China

[2] Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Peoples R China

[3] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia

[4] Shenyang Ligong Univ, Sch Environm & Chem Engn, Shenyang 110159, Peoples R China

[5] Peking Univ, Shenzhen Inst, Shenzhen Key Lab Human Tissue Regenerate & Repair, Shenzhen 518057, Peoples R China

来源：

MATERIALS & DESIGN | 2017年 / 121卷

基金：

中国国家自然科学基金;

关键词：

Mg alloys; LPSO phases; Corrosion; Electrochemical analysis; Mechanical properties; STACKING ORDERED STRUCTURES; MICROSTRUCTURE EVOLUTION; BEHAVIOR; MAGNESIUM; STRENGTH; STRESS; POLYTYPES; CHLORIDE; HARDNESS;

D O I：

10.1016/j.matdes.2017.02.078

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 alpha-Mg matrix. The galvanic-couple effect between LPSO phases and alpha-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%. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：430 / 441

页数：12

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