Effects of Laser Surface Remelting on Microstructure and Corrosion Properties of Mg-12Dy-1.1Ni Alloy

被引：4
作者：
Bi, Guangli [1 ,2 ]
Chen, Siqi [1 ,2 ]
Jiang, Jing [1 ,2 ]
Li, Yuandong [1 ,2 ]
Chen, Tijun [1 ,2 ]
Chen, Xiao-Bo [3 ]
Zhang, Duyao [3 ]
Qiu, Dong [3 ]
Easton, Mark [3 ]
机构：
[1] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China
[2] Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Peoples R China
[3] RMIT Univ, Sch Engn, RMIT Ctr Addit Mfg, Melbourne, Vic 3000, Australia
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2023年 / 32卷 / 06期
基金：
澳大利亚研究理事会; 中国国家自然科学基金;
关键词：
corrosion properties; laser surface remelting; LPSO phase; magnesium alloys; microstructure; MECHANICAL-PROPERTIES; MAGNESIUM ALLOY; CA ALLOY; ZN; BEHAVIOR; PARAMETERS; RESISTANCE;
D O I：
10.1007/s11665-022-06933-y
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Effects of laser surface remelting (LSR) on microstructure and corrosion properties of as-cast Mg-12Dy-1.1Ni (wt.%) alloy were investigated. The as-cast alloy was mainly composed of alpha-Mg, lamellar Mg12DyNi phase with an 18R-long period stacking order (LPSO) structure and Mg24Dy5. After LSR treatment, fine and compact 18R-LPSO phase reprecipitated on dendrite boundaries as a continuous network. In addition, the volume fraction of the LPSO phase remarkably increased to 34.9% and the grain size of as-cast alloy was refined to ca. 4 mu m. Electrochemical and immersion tests indicated that the LSR-treated alloy exhibited a lower weight loss rate (2.8 +/- 0.2 mg/cm(2)/h) and corrosion current density (160.1 +/- 20.7 mu A/cm(2), and of 37% reduction after LSR) than the as-cast alloy in 0.1 M NaCl solution. The improved corrosion resistance of the LSR alloy was mainly ascribed to the grain refinement and continuous distribution of 18R-LPSO phase on dendrite boundaries.
引用
收藏
页码：2587 / 2597
页数：11
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