Aluminum matrix composites reinforced with boron carbide are a kind of materials that are widely used because of high strength, low density, and improved tribological properties. In this study, mechanical properties of Al 6061–B4C composites reinforced with B4C of three different particle sizes were investigated. In the Al 6061–B4C composite materials, produced by the powder metallurgy methods (extrusion of billets obtained by sintering at temperature of 550°C under pressure of 450 MPa), the change of mechanical properties such as hardness, compressive strength, and fatigue life, related to B4C particle size and the applied heat treatment mode (aging at 180°C for 5 h), were investigated. The hardness of the materials is increased with B4C grain size and the heat treatment. After the heat treatment, the fatigue life of Al 6061–B4C (3 μm) material increases slightly, while that of the composite materials decreases with larger size of B4C reinforcement. The fatigue life of the composite materials reinforced with a larger grain size B4C is reduced by heat treatment. While the compression test data of untreated composite materials were similar to each other, the heat treatment increased these values in all samples. The highest increase in the compression strength was observed in the composite reinforced with 17 μm sized B4C. The addition of graphite reduces the deformation ability of the composites.

中文翻译：

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Al 6061-B4c复合材料的疲劳和压缩特性

碳化硼增强铝基复合材料由于具有高强度、低密度和改善的摩擦学性能而被广泛应用。在这项研究中，研究了用三种不同粒径的 B4C 增强的 Al 6061-B4C 复合材料的机械性能。Al 6061-B4C 复合材料，通过粉末冶金方法（挤压在 550°C 温度和 450 MPa 压力下烧结得到的坯料），硬度、抗压强度和疲劳寿命等机械性能的变化研究了与 B4C 粒径和应用热处理模式（在 180°C 下老化 5 小时）有关的 。材料的硬度随着B4C晶粒尺寸和热处理而增加。热处理后，Al 6061–B4C（3 μm）材料的疲劳寿命略有增加，而复合材料的疲劳寿命随着 B4C 增强材料尺寸的增大而降低。热处理降低了用较大晶粒尺寸B4C增强的复合材料的疲劳寿命。虽然未处理复合材料的压缩测试数据彼此相似，但热处理增加了所有样品中的这些值。在用 17 μm 尺寸的 B4C 增强的复合材料中观察到压缩强度的最大增加。石墨的加入降低了复合材料的变形能力。虽然未处理复合材料的压缩测试数据彼此相似，但热处理增加了所有样品中的这些值。在用 17 μm 尺寸的 B4C 增强的复合材料中观察到压缩强度的最大增加。石墨的加入降低了复合材料的变形能力。虽然未处理复合材料的压缩测试数据彼此相似，但热处理增加了所有样品中的这些值。在用 17 μm 尺寸的 B4C 增强的复合材料中观察到压缩强度的最大增加。石墨的加入降低了复合材料的变形能力。