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Developing a hybrid Al-SiC-graphite functionally graded composite material for optimum composition and mechanical properties

机译:开发杂化Al-SiC-石墨功能梯度复合材料,可用于最佳组成和机械性能

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摘要

A systematic methodology for developing hybrid Al-SiC-graphite functionally graded composite materials with the highest feasible SiC-content in the top-most layer, without resulting in residual porosities, has been established. The distribution of ceramic reinforcements in individual layers is very homogeneous, and the interlayer regions are free from any defect. Monolithic composites, having composition identical to the overall average compositions of the FGMs, were also fabricated, and their mechanical properties were compared with the corresponding FGM properties. Due to the locally high SiC-content, the top-layer hardness of the FGM is significantly higher than the corresponding monolithic composite. A systematic study of the flexural stress-strain behavior of individual mono-layers and the overall FGM was carried out at different orientations. For identical mono-layer compositions, the orientation of the FGM has a strong influence on its flexural stress-strain behavior. The failure stress is significantly higher when the layer containing high SiC-content is at the compressively loaded side during the 4-point bend test.
机译:已经建立了一种用于显影混合的杂交Al-SiC-石墨的系统方法,其顶层最高可行的SiC含量,没有导致残余孔隙率。单层中陶瓷增强物的分布非常均匀,并且中间区没有任何缺陷。还制造单片复合材料,该组合物具有与FGM的总体平均组成相同的组成,并将其机械性能与相应的FGM性质进行比较。由于局部高的SiC含量,FGM的顶层硬度明显高于相应的单片复合材料。对各种单层弯曲应力 - 应变行为的系统研究,并在不同的方向上进行了整体FGM。对于相同的单层组合物,FGM的取向对其弯曲应力应变行为具有很强的影响。当含有高SiC含量的层在4点弯曲试验期间,当含有高SiC含量的层处于压缩加载的侧面时,失效应力显着更高。

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