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

IMR OpenIR

	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.; Xu, DK (reprint author), Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China.
	2017-05-05
发表期刊	MATERIALS & DESIGN
ISSN	0264-1275
卷号	121 页码:430-441
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.; 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.
部门归属	[li, c. q. ; xu, d. k. ; han, e. h.] chinese acad sci, inst met res, key lab nucl mat & safety assessment, shenyang 110016, peoples r china ; [li, c. q. ; han, e. h.] northeastern univ, key lab anisotropy & texture mat, minist educ, shenyang 110819, peoples r china ; [li, c. q. ; zeng, z. r. ; chen, x. -b.] monash univ, dept mat sci & engn, clayton, vic 3800, australia ; [wang, b. j.] shenyang ligong univ, sch environm & chem engn, shenyang 110159, peoples r china ; [sheng, l. y.] peking univ, shenzhen inst, shenzhen key lab human tissue regenerate & repair, shenzhen 518057, peoples r china
关键词	Mg Alloys Lpso Phases Corrosion Electrochemical Analysis Mechanical Properties
学科领域	Materials Science, Multidisciplinary
资助者	National Natural Science Foundation of China Projects [51271183, 51301172]; National Basic Research Program of China (973 Program) Project [2013CB632205]; National Key Research and Development Program of China project [2016YFB0301105]; Shenzhen Technology Innovation Plan [CXZZ20140419114548507, CXZZ20140731091722497]; Shenzhen Basic Research Project [JCYJ20150529162228734]; Innovation Fund of Institute of Metal Research (IMR); Chinese Academy of Sciences (CAS)
收录类别	SCI
语种	英语
WOS记录号	WOS:000399625000045
引用统计	被引频次：151[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/78144
专题	中国科学院金属研究所
通讯作者	Xu, DK (reprint author), Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China.
推荐引用方式 GB/T 7714	Li, C. Q.,Xu, D. K.,Zeng, Z. R.,et al. Effect of volume fraction of LPSO phases on corrosion and mechanical properties of Mg-Zn-Y alloys[J]. MATERIALS & DESIGN,2017,121:430-441.
APA	Li, C. Q..,Xu, D. K..,Zeng, Z. R..,Wang, B. J..,Sheng, L. Y..,...&Xu, DK .(2017).Effect of volume fraction of LPSO phases on corrosion and mechanical properties of Mg-Zn-Y alloys.MATERIALS & DESIGN,121,430-441.
MLA	Li, C. Q.,et al."Effect of volume fraction of LPSO phases on corrosion and mechanical properties of Mg-Zn-Y alloys".MATERIALS & DESIGN 121(2017):430-441.