Effect of calcium addition on microstructure, casting fluidity and mechanical properties of Mg-Zn-Ce-Zr magnesium alloy

The influence of Ca addition on the as-cast microstructure, casting fluidity and mechanical properties of the Mg-4.2Zn-1.7Ce-0.5Zr（wt.%） alloy was investigated. The results showed that the as-cast alloys consisted of α-Mg matrix, Ca-contained T-phase and Mg51Zn20 phase. Addition of 0.2 wt.%–0.6 wt.%...

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Bibliographic Details
Published inJournal of rare earths Vol. 35; no. 5; pp. 503 - 509
Main Author 付玉 王晗 刘晓滕 郝海
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2017
Subjects
casting fluidity
mechanical properties
Mg-Zn-Ce-Zr alloy
microstructure
rare earths
Mg-Zn-Ce-Zr alloy
microstructure
Ca
casting fluidity
mechanical properties
rare earths
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Summary:The influence of Ca addition on the as-cast microstructure, casting fluidity and mechanical properties of the Mg-4.2Zn-1.7Ce-0.5Zr（wt.%） alloy was investigated. The results showed that the as-cast alloys consisted of α-Mg matrix, Ca-contained T-phase and Mg51Zn20 phase. Addition of 0.2 wt.%–0.6 wt.% Ca led to effective grain refinement and enhanced the fluidity of the alloys. When the content of Ca was 0.2 wt.%, the alloy exhibited the finest grain size of 35.9 μm, and the filling length was increased by approximately 55.4% compared with the quaternary alloy. The improvement of the fluidity was attributed to the grain refinement, less energy dissipation and the oxidation resistance of Ce and Ca. With an increase in Ca content, the yield strength increased gradually, whereas the ultimate tensile strength and elongation showed a decreasing tendency. Moreover, the fracture surface mode was quasi-cleavage fracture.
Bibliography:11-2788/TF
magnesium fluidity refinement ultimate tensile attributed eutectic equiaxed cleavage elongation
The influence of Ca addition on the as-cast microstructure, casting fluidity and mechanical properties of the Mg-4.2Zn-1.7Ce-0.5Zr（wt.%） alloy was investigated. The results showed that the as-cast alloys consisted of α-Mg matrix, Ca-contained T-phase and Mg51Zn20 phase. Addition of 0.2 wt.%–0.6 wt.% Ca led to effective grain refinement and enhanced the fluidity of the alloys. When the content of Ca was 0.2 wt.%, the alloy exhibited the finest grain size of 35.9 μm, and the filling length was increased by approximately 55.4% compared with the quaternary alloy. The improvement of the fluidity was attributed to the grain refinement, less energy dissipation and the oxidation resistance of Ce and Ca. With an increase in Ca content, the yield strength increased gradually, whereas the ultimate tensile strength and elongation showed a decreasing tendency. Moreover, the fracture surface mode was quasi-cleavage fracture.
FU Yu , WANG Han , LIU Xiaoteng , HAO Hai （Key Laboratory of SoBdification Control and Digital Preparation Technology （Liaoning Province）, School of Materials Science and Engineering, Dalian Uni- versity of Technology, Dalian 116024, China）
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(17)60940-2