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首页> 外文会议>TMS annual meeting exhibition >Effect of MgAI_2CU on the superficial hardness of hybrid-multimodal Al/SiC composites processed by reactive infiltration
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Effect of MgAI_2CU on the superficial hardness of hybrid-multimodal Al/SiC composites processed by reactive infiltration

机译：MgAl_2CU对反应浸渗复合多峰Al / SiC复合材料表面硬度的影响

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摘要

The effect of MgAl_2O_4 formed at the reinforcement/matrix interface, on the superficial hardness of hybrid Al/SiC composites processed by reactive infiltration was investigated. Composites were prepared from porous preforms of a-SiC and silica-coated a-SiC powders of 10, 86, and 146 urn. The preforms, with particle size distribution from monomodal to trimodal, contained 0.6 volume fraction of SiC. The infiltration tests with the alloy AI-13.3Mg-1.8Si (wt. %) were carried out in Ar→N2 atmosphere at 1100°C for 60 min. The composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition to density and residual porosity, superficial hardness measurements were performed. Results show that with spinel at the interfaces, residual porosity decreases and density and superficial hardness are slightly improved. This is attributed to the increase in the metal/ceramic interfacial joints by formation of the spinel phase and to an enhanced matrix/reinforcement load transmission.
机译：研究了在加强/基质界面处形成的MgAl_2O_4对通过反应渗透处理的杂化Al / SiC复合材料的浅表性的影响。复合材料由10,86和146瓮的A-SiC和二氧化硅涂覆的A-SiC粉末的多孔预成型制备。具有从单阳极分布的粒度分布的预制件含有0.6体积的SiC。用合金AI-13mg-1.8SI（重量％）在ar→N 2气氛中在1100℃下进行60分钟的渗透试验。复合材料的特征在于X射线衍射（XRD）和扫描电子显微镜（SEM）。除了密度和残余孔隙率之外，还进行浅表性硬度测量。结果表明，在界面处，尖晶石，残余孔隙率降低，密度和浅表硬度略微改善。这归因于通过形成尖晶石相和增强的基质/增强载荷传输来归因于金属/陶瓷界面关节的增加。

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