In vitro corrosion of Mg–1.21Li –1.12Ca –1Y alloy |
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作者姓名: | Rongchang Zeng Weichen Qi Fen Zhang Hongzhi Cui Yufeng Zheng |
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作者单位: | College of Materials Science and Engineering, Shandong University of Science and Technology;State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology;State Key Laboratory for Turbulence and Complex System, Department of Materials Science and Engineering, College of Engineering,Peking University |
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基金项目: | financially supported by National Natural Science Foundation (NSF) of China (51241001);NSF of Shandong Province (ZR2011EMM004);SDUST Research Fund (2014TDJH104);Joint Innovative Center for Safe and Effective Mining Technology and Equipment of Coal Resources and Taishan Scholarship Project of Shandong Province (TS20110828) |
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摘 要: | The influence of the microstructure on mechanical properties and corrosion behavior of the Mg–1.21Li–1.12Ca–1Y alloy was investigated using OM, SEM, XRD, EPMA, EDS, tensile tests and corrosion measurements. The results demonstrated that the microstructure of the Mg–1.21Li–1.12Ca–1Y alloy was characterized by α-Mg substrate and intermetallic compounds Mg2 Ca and Mg24Y5. Most of the fine Mg2 Ca particles for the as-cast alloy were distributed along the grain boundaries, while for the as-extruded along the extrusion direction. The Mg24Y5 particles with a larger size than the Mg2 Ca particles were positioned inside the grains. The mechanical properties of Mg–1.21Li–1.12Ca–1Y alloy were improved by the grain refinement and dispersion strengthening. Corrosion pits initiated at the α-Mg matrix neighboring the Mg2 Ca particles and subsequently the alloy exhibited general corrosion and filiform corrosion as the corrosion product layer of Mg(OH)2and Mg CO3 became compact and thick.
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关 键 词: | Magnesium–lithium alloys Microstructure Mechanical property Corrosion Biomaterial |
收稿时间: | 2014-07-02 |
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