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Microstructure and Mechanical Properties of Hypo- and Hypereutectic Cast Mg/Mg2Si Composites

机译：贮效和过度沉淀Mg / Mg2SI复合材料的组织和力学性能

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摘要

In this paper, the microstructure and mechanical properties of two magnesium matrix composites—a hypoeutectic with 1.9 wt% Mg Si phase and a hypereutectic with 19 wt% Mg Si compound—were analyzed. The investigated materials were prepared using the gravity casting method. Microstructure analyses of the fabricated composites were carried out by XRD and light microscopy. The tensile and compression strength as well as yield strength of the composites were examined in both uniaxial tensile and compression tests. The microstructure of the hypoeutectic composite was in agreement with the phase diagram and composed of primary Mg dendrites and an Mg–Mg Si eutectic mixture. For the hypereutectic composite, besides the primary Mg Si phase and eutectic mixture, additional magnesium dendrites surrounding the Mg Si compound were observed due to nonequilibrium solidification conditions. The composites exhibited a rise in the examined mechanical properties with an increase in the Mg Si weight fraction and also a higher tensile and compression strength in comparison to the pure magnesium matrix (cast in the same conditions). Additionally, analyses of fracture surfaces of the composites carried out using scanning electron microscopy (SEM + EDX) are presented.
机译：本文分析了两种镁基复合材料的微观结构和机械性能 - 用1.9wt％Mg Si相和过度晶二结节晶二结节，具有19wt％Mg Si化合物 - 得到过沉淀。使用重力铸造方法制备研究的材料。通过XRD和光学显微镜进行制造复合材料的微观结构分析。在单轴拉伸和压缩试验中，检查复合材料的拉伸和压缩强度以及屈服强度。双重结晶复合材料的微观结构与相图一致并由初级Mg树突和Mg-Mg Si共晶混合物组成。对于过度化复合材料，除了初级Mg Si相和共晶混合物之外，由于非凝固条件下，观察到围绕Mg Si化合物的附加镁树枝状。复合材料在与纯镁基质（在相同条件下浇铸的铸造）相比，复合材料在检查的机械性能下升高，并且还具有更高的拉伸和压缩强度（在相同条件下浇铸）。另外，提出了使用扫描电子显微镜（SEM + EDX）进行的复合材料的裂缝表面的分析。

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