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首页> 外文期刊>Materials and Manufacturing Processes >Mg/B_4C Composites with a High Volume Fraction of Fine Ceramic Reinforcement
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Mg/B_4C Composites with a High Volume Fraction of Fine Ceramic Reinforcement

机译：具有高体积分数的精细陶瓷增强的Mg / B_4C复合材料

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摘要

The results of a study aimed at establishing an understanding of the role of particulate reinforcement on the hardness and tensile deformation of a magnesium-based matrix discontinuously-reinforced with a high volume fraction (approx. 50 vol percent ) of boron carbide (B_4C) particulates are reported. Composites were fabricated by pressureless infiltration of porous boron carbide preforms with molten magnesium under a flowing nitrogen atmosphere. The capabilities of such a fabrication route for production of magnesium-based composites with a high volume fraction of a bimodal mixture of coarse (d_(50) = 44 mum) and fine (d_(50) - 0.8 mum) boron carbide particulates uniformly distributed in the matrix were also investigated. The successful initiation of spontaneous infiltration was found to be influenced by several processing parameters which were identified and investigated. Thus, the microstructure and mechanical properties of the fabricated composites were investigated in the light of the influence of the initial perform composition (boron carbide bimodal mixture composition and the wetting agents (Si and Ti powders) applied) and the infiltration parameters. The high volume fraction of particulate reinforcement content successfully achieved by pressureless infiltration was found to improve the hardness and tensile properties of the composites significantly compared to unreinforced counterparts. On the contrary, the reinforcement had a detrimental influence on ductility. Moreover, the experimental findings clearly confirmed that the influence of the reinforcing boron carbide phase on the mechanical response of Mg/B_4C composites is predominantly through the volume fraction of ceramic particulate in the matrix, and much less through the average particle size of the ceramic filler applied.
机译：旨在确定颗粒增强对以高体积分数（约50体积％）的碳化硼（B_4C）颗粒不连续增强的镁基基质的硬度和拉伸变形的作用的研究结果被报道。通过在流动的氮气气氛下用熔融镁对多孔碳化硼预成型坯进行无压浸渗来制造复合材料。这种制造路线可生产具有高体积分数的粗（d_（50）= 44 mum）和细小（d_（50）-0.8 mum）碳化硼微粒的双峰混合物的镁基复合材料的生产能力在矩阵中也进行了研究。发现自发渗透的成功启动受确定和研究的几个加工参数的影响。因此，根据初始性能成分（碳化硼双峰混合物成分和所用润湿剂（Si和Ti粉末）的使用）和渗透参数的影响，研究了复合材料的微观结构和力学性能。发现通过无压渗透成功实现的高体积分数的颗粒增强物含量与未增强的对应物相比显着改善了复合材料的硬度和拉伸性能。相反，增强对延展性有不利影响。此外，实验结果清楚地证实，增强碳化硼相对Mg / B_4C复合材料的机械响应的影响主要是通过基质中陶瓷颗粒的体积分数，而不是通过陶瓷填料的平均粒径来决定的。应用。

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