Abstract

In the future, hybrid aluminum matrix composites, which are the second generation composites, will be replaced by solid reinforced third-generation quaternary hybrid composites in which nano- and micro-scale reinforcement particles are used together. In this study, microwave sinterability of B₄C, TiO₂ (nm + µm), and nGr reinforced quaternary hybrid composites that had AlCu4.5SiMg alloyed Matrix, and their microstructural and tribological properties after sintering were examined. The proportion of nGr in the composite sample was taken as 0.5 wt%, while B₄C and TiO₂ were used in three different proportions (3, 9, 12 wt%). After being compressed under 600 MPa pressure, the composite samples were sintered for 60 min at 550 °C by a microwave oven with a power of 2.9 kW and a frequency of 2.45 GHz. It was determined that due to its high microwave absorbency, B₄C reinforcement improved the microwave sinterability more compared to TiO₂. In XRD analyses, whereas Al₄C₃ and Al₃BC reaction products were not seen as harmful, the intermetallic phase of Al₂Cu was detected. It was determined that both friction coefficient and wear resistance increased as the proportion of B₄C increased in composite samples. In AlCu4.5SiMg–(12 wt% B₄C/3 wt% TiO₂/0.5 wt% nGr) quaternary hybrid composites with the highest hardness (97.6 HV), the lowest specific wear rate (0.118 mm³ Nm × 10⁻³) was detected.

Graphic Abstract

中文翻译：

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微波烧结新型AlCu4.5SiMg合金-（B 4 C / TiO 2 / nGr）四元杂化复合材料的表征和摩擦学性能

摘要

将来，作为第二代复合材料的杂化铝基复合材料将被固体增强的第三代四元杂化复合材料取代，后者将纳米级和微米级增强颗粒一起使用。在这项研究中，研究了具有AlCu4.5SiMg合金基体的B ₄ C，TiO ₂（nm + µm）和nGr增强的四元杂化复合材料的微波烧结性能，以及烧结后的微观结构和摩擦学性能。复合样品中nGr的比例为0.5 wt％，而B ₄ C和TiO ₂以三种不同的比例（3、9、12重量％）使用。在600 MPa压力下压缩后，将复合样品在550°C的微波炉中以2.9 kW的功率和2.45 GHz的频率烧结60分钟。已经确定，由于其高的微波吸收性，与TiO ₂相比，B ₄ C增强剂进一步改善了微波可烧结性。在XRD分析中，虽然Al ₄ C ₃和Al ₃ BC反应产物没有被认为是有害的，但检测到了Al ₂ Cu的金属间相。已确定，随着复合样品中B ₄ C比例的增加，摩擦系数和耐磨性均增加。在AlCu4.5SiMg–（12 wt％B_检测到具有最高硬度（97.6 HV），最低比磨损率（0.118 mm ³  Nm×10 ^-3）的₄ C / 3 wt％TiO ₂ /0.5 wt％nGr）四元杂化复合材料。

图形摘要