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Some studies on aluminium matrix in-situ composites produced by stir casting method

机译:搅拌铸造法制备铝基原位复合材料的一些研究

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摘要

During the last two decades, metal matrix composites (MMCs) have emerged as an important class of materials for structural, wear, thermal, transportation and electrical applications. Metal matrix composites (MMCs) possess significantly improved properties including high specificudstrength; specific modulus, damping capacity and good wear resistance compared to unreinforced alloys. There are several techniques to produce composites, such as liquid state, solid state and semi solid state production route. Among the entire liquid state production route stir casting route are simplest and cheapest. The aim of our project is to produce a composite with cheap and simple production route i.e. stir casting method. We have chosen low grade iron ore as the reinforcement material and commercially pure aluminium as matrix phase. For the fabrication of in-situ composite wettability of the iron ore particles by liquid Al is essential. To improve wettability, Mg is added into Al melt .After fabrication; composites have been characterized for their morphology, mechanical and wear properties to see their suitability as a wear resistance material. Wear test was performed as a function of sliding distance, applied load, sliding velocity with the help of Pin-On-Disc wear test machine. The worn surfaces were analyzed using scanning electron microscope. The mechanical properties such as hardness have been investigated.
机译:在过去的二十年中,金属基复合材料(MMC)成为一类重要的结构,磨损,热,运输和电气应用材料。金属基复合材料(MMC)具有明显改善的性能,包括高比强度/强度;与非增强合金相比,它具有更高的比模量,阻尼能力和良好的耐磨性。有几种生产复合材料的技术,例如液态,固态和半固态生产路线。在整个液态生产路线中,搅拌铸造路线是最简单和最便宜的。我们项目的目的是使用廉价且简单的生产路线(即搅拌铸造法)生产复合材料。我们选择了低品位铁矿石作为增强材料,选择了商业纯铝作为基质相。为了制造液态铝对铁矿石颗粒的原位复合润湿性至关重要。为了提高润湿性,将Mg添加到Al熔体中。复合材料的形貌,机械性能和磨损性能得到了表征,以使其适合用作耐磨材料。借助于Pin-On-Disc磨损测试机,进行了滑动距离,施加载荷,滑动速度的函数的磨损测试。使用扫描电子显微镜分析磨损的表面。已经研究了诸如硬度的机械性能。

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