Abstract

Ceramic reinforcements are used in metal matrix composite materials to enhance the mechanical properties. Ceramic particles also improve the wear behavior of these materials because of their high hardness. In this study, the wear properties of Al 6061–B4C composite materials reinforced with B4C in different sizes were investigated. Al 6061 powders, which are mixed with B4C powders in three different sizes at a volume fraction of 10%, are sintered at 550°C under 450 MPa pressure for 2 h. The billets were formed to composite bars by direct extrusion process. It was also produced some hybrid composites including graphite reinforcement. The effects of B4C reinforcement size, shear rate, heat treatment and graphite reinforcement on wear behavior of the composite were investigated. Wear tests were carried out under dry conditions with pin-on-disc test configuration. The adding of the B4C reinforcement to the matrix material increased the wear resistance, and the wear resistance of composites was improved further by the increasing of B4C grain size. It was seen that the graphite reinforcement has not positive effect on wear properties. The heat treatment that applied to composites, improved the mechanical properties of the composite materials. However, in heat treated composites, the wear resistance were decreased with the increasing of the B4C grain size.

中文翻译：

---

Al 6061-B4C金属基复合材料摩擦学行为研究

摘要

陶瓷增强材料用于金属基复合材料以提高机械性能。由于陶瓷颗粒的高硬度，它们还改善了这些材料的磨损性能。在这项研究中，研究了不同尺寸的 B4C 增强的 Al 6061-B4C 复合材料的磨损性能。Al 6061 粉末与三种不同尺寸的 B4C 粉末以 10% 的体积分数混合，在 550°C 和 450 MPa 压力下烧结 2 小时。坯料通过直接挤压工艺形成复合棒材。它还生产了一些混合复合材料，包括石墨增强材料。研究了B4C增强体尺寸、剪切速率、热处理和石墨增强体对复合材料磨损行为的影响。磨损测试是在干燥条件下进行的，采用销盘式测试配置。在基体材料中加入B4C增强体提高了耐磨性，随着B4C晶粒尺寸的增加，复合材料的耐磨性进一步提高。可以看出，石墨增强材料对磨损性能没有积极影响。应用于复合材料的热处理，提高了复合材料的力学性能。然而，在热处理复合材料中，耐磨性随着 B4C 晶粒尺寸的增加而降低。可以看出，石墨增强材料对磨损性能没有积极影响。应用于复合材料的热处理，提高了复合材料的力学性能。然而，在热处理复合材料中，耐磨性随着 B4C 晶粒尺寸的增加而降低。可以看出，石墨增强材料对磨损性能没有积极影响。应用于复合材料的热处理，提高了复合材料的力学性能。然而，在热处理复合材料中，耐磨性随着 B4C 晶粒尺寸的增加而降低。