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王力鹏,边丽萍,赵元亮,曾航航,梁伟,赵兴国.Li对快速凝固Mg96.5Gd2.5Zn1合金微观组织和力学性能的影响[J].稀有金属材料与工程(英文),2018,47(10):3223~3227.[Wang Li-peng,Bian Li-ping,Zhao Yuan-liang,Zeng Hang-hang,Liang Wei and Zhao Xongguo.Effects of Li on the Microstructure and Mechanical Properties of Rapid Solidification of Mg96.5Gd2.5Zn1 Alloy[J].Rare Metal Materials and Engineering,2018,47(10):3223~3227.]
Effects of Li on the Microstructure and Mechanical Properties of Rapid Solidification of Mg96.5Gd2.5Zn1 Alloy
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Received:January 09, 2017  Revised:August 28, 2018
DOI:
Key words: Mg-Gd-Zn alloy  Long-period stacking ordered  Microstructure  Mechanical Properties
Foundation item:国家自然科学基金资助(51401143);山西省青年科技研究资助(2014021017-1);山西省回国留学人员科研资助项目(2014-029);
Author NameAffiliation
Wang Li-peng,Bian Li-ping,Zhao Yuan-liang,Zeng Hang-hang,Liang Wei and Zhao Xongguo  
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Abstract:
      The effects of different amounts of Li addition on the microstructure and mechanical properties of Mg96.5Gd2.5Zn1 alloy by rapid solidification are investigated. The results indicate that the supersaturation of Gd and Zn solute atoms in the Mg matrix grain in the as-cast alloys decreased, (Mg, Zn) 3Gd precipitates located at the grain boundaries increased and the grain size of Mg matrix was reduced with Li addition. After solid-solution treatment, the formation of 14H type of long-period stacking phase in the alloys was inhibited and the nano- or submicron (Mg, Zn) 3Gd phase precipitated in large amounts with the increase of Li addition. And the Li content is 7.6 at. %, there is no LPSO formation in the alloy. After hot extrusion deformation, the block 14H phase in the alloys was kinked and delaminated, and lamellar 14H was dissolved in the matrix to some extent and (Mg,Zn)3Gd phase was fragmented and refined, the recrystallization occurred in the matrix in different extents. Mg96.5Gd2.5Zn1 alloy exhibits the best comprehensive mechanical property with the UTS of 325MPa and the EL of 9.5 %, whereas the mechanical properties of the alloys without Li addition decline gradually with the increase of Li addition. The microstructural evolution mechanism and mechanical behavior response under various conditions are analyzed.