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Effect of mechanical and thermal loading on boron carbide particles reinforced Al-6061 alloy

机译:机械载荷和热载荷对碳化硼颗粒增强Al-6061合金的影响

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摘要

Metal Matrix Composites (MMC) considered as one of the 'advanced materials' have evoked growing interest during the last three decades due to their high performance and applications in strategic sectors. These composites exhibit unique and attractive properties over the monolithic alloys, but suffer from low ductility, which makes them not so attractive for some of the applications where high toughness is one of the design criteria. This limitation of MMCs has been overcome by resorting to various treatments such as mechanical and thermal loading. Considering very limited reports available on Al alloy reinforced with boron carbide (B_4C) particles, this paper presents (ⅰ) preparation of Al-6061 alloy reinforced with 1.5-10 wt% B_4C, (ⅱ) subjecting them to mechanical and thermal treatments and (ⅲ) characterization of all the above samples. Specific ultimate tensile strength and hardness of all the composites were higher than those of matrix. Also, these values increased with increasing amount of particles, with composites containing 8wt% B_4C showing the maximum values in all the three conditions. These observations are supported by the uniform distribution of particles in the matrix as observed in their microstructure.
机译:在过去的三十年里,由于金属基复合材料(MMC)的高性能和在战略领域的应用,引起了越来越多的关注。这些复合材料相对于整体合金具有独特和吸引人的性能,但延展性低,这使得它们对某些将高韧性作为设计标准之一的应用没有吸引力。 MMC的这一局限性已通过采用各种方法(例如机械和热负荷)克服了。考虑到关于碳化硼(B_4C)颗粒增强的铝合金的报道非常有限,本文提出(ⅰ)制备1.5-10 wt%B_4C增强的Al-6061合金,(ⅱ)对其进行机械和热处理,以及( ⅲ)以上所有样品的表征。所有复合材料的比极限抗拉强度和硬度均高于基体。而且,这些值随着颗粒数量的增加而增加,其中含有8wt%B_4C的复合材料在所有三个条件下均显示出最大值。这些观察结果由其微观结构中观察到的颗粒在基质中的均匀分布来支持。

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