In this investigation, powder metallurgy route was employed to synthesize SiO2 (5, 10 and 15 vol%) coated aluminium borate whisker (ABOw) reinforced aluminium composites. Commercial pure aluminium powder was used as matrix material and SiO2 coated ABOw was used as reinforcements. M icrostructures of the composites were characterized using scanning electron microscopy and high resolution scanning electron microscopy. Energy dispersive spectroscopy was employed to confirm the weight percentages of elements present in the composites. Transmission electron microscopic analysis was performed to observe morphological changes in the composites. X-ray diffraction analysis was carried out to confirm the phases of developed reinforcement and composites. A universal testing machine was employed for the observation of mechanical properties, viz. flexural strength, Young’s modulus and diametral compressive strength, and it was found that the mechanical strength improved by 50-55% in the case of 10 vol% SiO2 coated Al-ABOw composite. The effect of SiO2 coating on the hardness of fabricated composite was also evaluated and the maximum microhardness value was observed to be 46.2 HV in 10 vol% SiO2 coated composite. Themicrostructural analysis showed that excellent grain refined structures with improved mechanical strength were obtained. GRAPHICAL ABSTRACT

中文翻译：

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SiO2涂层对粉末冶金法合成Al-ABOw复合材料组织和力学性能的影响

在本研究中，采用粉末冶金路线合成了 SiO2（5、10 和 15 vol%）包覆的硼酸铝晶须（ABOw）增强铝复合材料。商业纯铝粉用作基体材料，SiO2 涂层的 ABOw 用作增强材料。使用扫描电子显微镜和高分辨率扫描电子显微镜表征复合材料的微观结构。使用能量色散光谱来确认复合材料中存在的元素的重量百分比。进行透射电子显微镜分析以观察复合材料的形态变化。进行 X 射线衍射分析以确认开发的增强材料和复合材料的相。万能试验机用于观察机械性能，即。弯曲强度、杨氏模量和径向压缩强度，发现在 10 vol% SiO2 涂层的 Al-ABOw 复合材料的情况下，机械强度提高了 50-55%。还评估了 SiO2 涂层对制备的复合材料硬度的影响，观察到 10 vol% SiO2 涂层复合材料的最大显微硬度值为 46.2 HV。显微组织分析表明，获得了优异的晶粒细化组织，并提高了机械强度。图形概要 2 HV 在 10 vol% SiO2 涂层复合材料中。显微组织分析表明，获得了优异的晶粒细化组织，并提高了机械强度。图形概要 2 HV 在 10 vol% SiO2 涂层复合材料中。显微组织分析表明，获得了优异的晶粒细化组织，并提高了机械强度。图形概要