Microstructure evolution and corrosion properties of Mg-Dy-Zn alloy during cooling after solution treatment

Microstructure evolution and corrosion properties of Mg-2Dy-0.5Zn （at.%） alloy during cooling after solution treatment were investigated. The microstructure of alloy in the solid solution state （530 oC, 12 h） was composed ofα-Mg and small amounts of （Mg, Zn）xDy phases. During cooling at a cooling ra...

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Published inJournal of rare earths Vol. 34; no. 9; pp. 931 - 937
Main Author 毕广利 姜静 张帆 房大庆 李元东 马颖 郝远
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.09.2016
Subjects
cooling
corrosion properties
LPSO phase
Mg-Dy-Zn alloy
microstructure evolution
rare earths
体积分数
冷却时间
冷却过程
冷却速率
固溶处理
微观组织演变
腐蚀性能
锌合金
cooling
corrosion properties
Mg-Dy-Zn alloy
microstructure evolution
LPSO phase
rare earths
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Summary:Microstructure evolution and corrosion properties of Mg-2Dy-0.5Zn （at.%） alloy during cooling after solution treatment were investigated. The microstructure of alloy in the solid solution state （530 oC, 12 h） was composed ofα-Mg and small amounts of （Mg, Zn）xDy phases. During cooling at a cooling rate of 2 oC/min, the 14H-type LPSO phase gradually precipitated in the grain inte-rior and its volume fraction increased with increasing cooling time. The alloy cooled for 20 min exhibited the highest hardness value. In addition, electrochemical and immersion test results indicated that the alloy cooled for 5 min exhibited small corrosion current and low corrosion rate. The good corrosion resistance of alloy was mainly attributed to the continuous distribution of LPSO phase along the grain boundary.
Bibliography:Microstructure evolution and corrosion properties of Mg-2Dy-0.5Zn （at.%） alloy during cooling after solution treatment were investigated. The microstructure of alloy in the solid solution state （530 oC, 12 h） was composed ofα-Mg and small amounts of （Mg, Zn）xDy phases. During cooling at a cooling rate of 2 oC/min, the 14H-type LPSO phase gradually precipitated in the grain inte-rior and its volume fraction increased with increasing cooling time. The alloy cooled for 20 min exhibited the highest hardness value. In addition, electrochemical and immersion test results indicated that the alloy cooled for 5 min exhibited small corrosion current and low corrosion rate. The good corrosion resistance of alloy was mainly attributed to the continuous distribution of LPSO phase along the grain boundary.
BI Guangli , JIANG Jing , ZHANG Fan , FANG Daqing , LI Yuandong , MA Ying , HAO Yuan （1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China; 2. Key Laboratory of Nonferrous Metal Alloys and Processing, Ministry of Education, Lanzhou University of Technology Lanzhou 730050, China; 3. College of Mate- rials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China）
11-2788/TF
Mg-Dy-Zn alloy; LPSO phase; cooling; microstructure evolution; corrosion properties; rare earths
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(16)60117-5