Abstract Al/B 4 C composites with various volume contents of B 4 C (5%, 10%, 15%, 20%, and 25%) reinforcing the Al matrix, have been fabricated by vacuum hot press sintering at 680 °C, with a soaking time of 90 min and external pressure of 30 MPa. Mechanical properties, phase composition, and microstructure of the Al/B 4 C composites are discussed to reveal the physical properties of the composites. Field emission transmission electron microscopy and selected area electron diffraction have been employed to verify the interior structure and crystal growth direction, respectively. The Vickers hardness, fracture strength, tensile strength, and maximum force attained the optimal values of 108.45 ± 4.02 HV, 585.70 ± 23.26 MPa, 196.18 ± 2.48 MPa, and 4.44 ± 0.17 kN, respectively, for 25 vol% B 4 C/Al composites. The static compression strength increased before the 15 vol% B 4 C addition and then decreased, acquiring the highest value of 292.15 ± 2.09 MPa for 15 vol% B 4 C/Al composites. In general, the relative density and ductility of these composites consistently increased, with an increase in the volume content of Al, achieving a maximum of 99.22% and 54.63 ± 7.34%, respectively, for 5 vol% B 4 C/Al composites.

中文翻译：

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真空热压Al/B 4 C复合材料的显微形貌和力学性能

摘要 通过真空热压烧结在 680 °C 下制备了具有不同体积含量的 B 4 C（5%、10%、15%、20% 和 25%）的 Al/B 4 C 复合材料，增强了 Al 基体，浸泡时间为 90 分钟，外压为 30 兆帕。讨论了 Al/B 4 C 复合材料的机械性能、相组成和微观结构，以揭示复合材料的物理性能。场发射透射电子显微镜和选区电子衍射已分别用于验证内部结构和晶体生长方向。维氏硬度、断裂强度、抗拉强度和最大力分别达到 108.45 ± 4.02 HV、585.70 ± 23.26 MPa、196.18 ± 2.48 MPa 和 4.44 ± 0.17 kN 的最佳值，对于 25 vol% C B 4复合材料。静态压缩强度在添加 15 vol% B 4 C 之前先增加然后下降，对于 15 vol% B 4 C/Al 复合材料获得最高值 292.15 ± 2.09 MPa。一般来说，随着Al体积含量的增加，这些复合材料的相对密度和延展性持续增加，对于5体积%的B 4 C/Al复合材料，分别达到99.22%和54.63±7.34%的最大值。