Influence of neodymium addition on microstructure, tensile properties and fracture behavior of cast AI-MgeSi metal matrix composite

The influence of Nd on the microstructures, tensile properties and fracture behavior of cast Al-18 wt.%Mg2Si/n situ metal matrix composite was investigated. Experimental results showed that, after introducing a proper amount of Nd, both primary and eutectic Mg2Si in the Al-18 wt.%Mg2Si composite wer...

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Bibliographic Details
Published in中国稀土学报：英文版 Vol. 31; no. 3; pp. 307 - 312
Main Author WU Xiaofeng ZHANG Guang＇an WU Fufa WANG Zhe
Format Journal Article
LanguageEnglish
Published 2013
Subjects
Mg2Si
力学性能
微观结构
断裂行为
显微组织
极限抗拉强度
金属基复合材料
钕
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Summary:The influence of Nd on the microstructures, tensile properties and fracture behavior of cast Al-18 wt.%Mg2Si/n situ metal matrix composite was investigated. Experimental results showed that, after introducing a proper amount of Nd, both primary and eutectic Mg2Si in the Al-18 wt.%Mg2Si composite were well modified. The morphology of primary MgaSi was changed fi＇om irregular or dendritic to polyhedral shape, and its average particle size was significantly decreased from 47.5 to 13.0 μm. Moreover, the morphology of the eutectic Mg2Si phase was altered from flake-like to a thin laminar, short fibrous or dot-like structure. Tensile tests revealed that Nd addition improved the tensile strength and ductility of the material. Compared with those of unmodified composite, the ultimate tensile strength and percentage elongation with 0.5% Nd were increased by 32.4% and 200%, respectively. At the same time, Nd addition changed the fracture behavior from brittle to ductile.
Bibliography:A1/Mg2Si composites; casting; Nd addition; microstructural characterization; tensile properties; rare earths
11-2788/TF
The influence of Nd on the microstructures, tensile properties and fracture behavior of cast Al-18 wt.%Mg2Si/n situ metal matrix composite was investigated. Experimental results showed that, after introducing a proper amount of Nd, both primary and eutectic Mg2Si in the Al-18 wt.%Mg2Si composite were well modified. The morphology of primary MgaSi was changed fi＇om irregular or dendritic to polyhedral shape, and its average particle size was significantly decreased from 47.5 to 13.0 μm. Moreover, the morphology of the eutectic Mg2Si phase was altered from flake-like to a thin laminar, short fibrous or dot-like structure. Tensile tests revealed that Nd addition improved the tensile strength and ductility of the material. Compared with those of unmodified composite, the ultimate tensile strength and percentage elongation with 0.5% Nd were increased by 32.4% and 200%, respectively. At the same time, Nd addition changed the fracture behavior from brittle to ductile.
ISSN:1002-0721
2509-4963