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首页> 外文期刊>Journal of Materials Engineering and Performance >Fabrication and Characterization of Cast Magnesium Matrix Composites by Vacuum Stir Casting Process
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Fabrication and Characterization of Cast Magnesium Matrix Composites by Vacuum Stir Casting Process

机译：真空搅拌铸造法铸造镁基复合材料的制备与表征

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A vacuum stir casting process is developed to produce SiC_p reinforced cast magnesium matrix composites. This process can eliminate the entrapment of external gas onto melt and oxidation of magnesium during stirring synthesis. Two composites with Mg-Al9Zn and Mg-Zn5Zr alloys as matrices and 15 vol. percent SiC particles as reinforcement are obtained. The microstructure and mechanical properties of the composites and the unreinforced alloys in as-cast and heat treatment conditions are analyzed and evaluated. In 15 vol. percent SiC_p reinforced Mg-Al9Zn alloy-based composite (Mg-Al9Zn/15SiC_p), SiC particles distribute homogenously in the matrix and are well bonded with magnesium. In 15 vol. percent SiC_p reinforced Mg-Zn5Zr alloy-based composite (Mg-Zn5Zr/15SiC_p), some agglomerations of SiC particles can be seen in the microstructure. In the same stirring process conditions, SiC reinforcement is more easily wetted by magnesium in the Mg-Al9Zn melt than in the Mg-Zn5Zr melt. The significant improvement in yield strength and elastic modulus for two composites has been achieved, especially for the Mg-Al9Zn/15SiC_p composite in which yield strength and elastic modulus increase 112 and 33 percent, respectively, over the unreinforced alloy, and increase 24 and 21 percent, respectively, for the Mg-Zn5Zr/15SiC_p composite. The strain-hardening behaviors of the two composites and their matrix alloys were analyzed based on the microstructure characteristics of the materials.
机译：开发了真空搅拌铸造工艺以生产SiC_p增强铸造镁基复合材料。该过程可以消除搅拌合成过程中外部气体截留在熔体上和镁的氧化。两种以Mg-Al9Zn和Mg-Zn5Zr合金为基体和15 vol。获得50％的SiC颗粒作为增强材料。分析和评估了复合材料和未增强合金在铸态和热处理条件下的微观结构和力学性能。在15卷中SiC_p增强的Mg-Al9Zn合金基复合材料（Mg-Al9Zn / 15SiC_p）中，SiC颗粒均匀地分布在基体中并与镁良好结合。在15卷中SiC_p增强的Mg-Zn5Zr合金基复合材料（Mg-Zn5Zr / 15SiC_p）的百分比，在显微组织中可以看到SiC颗粒的一些团聚。在相同的搅拌过程条件下，Mg-Al9Zn熔体中的镁比Mg-Zn5Zr熔体中的SiC增强材料更容易被镁润湿。两种复合材料的屈服强度和弹性模量均取得了显着改善，特别是对于Mg-Al9Zn / 15SiC_p复合材料，其屈服强度和弹性模量分别比未增强合金提高了112％和33％，分别提高了24和21 Mg-Zn5Zr / 15SiC_p复合材料的百分含量基于材料的微观结构特征，分析了两种复合材料及其基体合金的应变硬化行为。

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