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首页> 外文期刊>Materials Science and Engineering >Microstructure and mechanical properties of stir cast ZX51/Al_2O_3p magnesium matrix composites
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Microstructure and mechanical properties of stir cast ZX51/Al_2O_3p magnesium matrix composites

机译：ZX51 / Al_2O_3p镁铸造镁基复合材料的组织与力学性能。

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摘要

Magnesium matrix composites can overcome the limitations of magnesium and its alloys. This paper investigates the effect of adding Al_2O_3 microparticles on microstructure and mechanical response of ZX51 alloy-matrix composites. Stir casting process was chosen due largely to its low cost to fabricate the novel ZX51/Al_2O_3p composites. Scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffractometry were used in order to analyze the microstructure of as-cast composites. Tension, compression, and Brinell hardness tests were performed to determine mechanical properties of the composites. It was revealed that the microstructure of matrix alloy is composed of α-Mg grains and (α-Mg+Ca_2Mg_6Zn_3) eutectic mixture distributed predominantly along grain boundaries. The addition of Al_2O_3p brought about a marked grain refinement and also introduced slight amounts of porosity. The results showed that with increasing volume percentage of Al_2O_3p, hardness and yield strength increase while tensile strength, compressive strength, and ductility decrease; in consequence, toughness decreases as well.
机译：镁基复合材料可以克服镁及其合金的局限性。本文研究了添加Al_2O_3微粒对ZX51合金-基体复合材料的组织和力学响应的影响。之所以选择搅拌铸造工艺，是因为其成本低廉，可以制造新型ZX51 / Al_2O_3p复合材料。为了分析铸态复合材料的微观结构，使用了扫描电子显微镜，能量色散光谱和X射线衍射法。进行拉伸，压缩和布氏硬度测试以确定复合材料的机械性能。结果表明，基体合金的微观结构由α-Mg晶粒和（α-Mg+ Ca_2Mg_6Zn_3）共晶混合物主要沿晶界分布组成。 Al_2O_3p的添加带来了明显的晶粒细化，并且还引入了少量的孔隙率。结果表明，随着Al_2O_3p体积百分比的增加，硬度和屈服强度增加，而抗拉强度，抗压强度和延展性降低。结果，韧性也降低。

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