Abstract

In this study, the wear behaviors of the solution-treated and as-extruded SiC_p /AZ91D metal matrix composites with different sizes and volume fractions of SiC particles were systematically investigated under different wear test parameters. The SiC particles exhibited a typical necklace-type distribution in the solution-treated composites and a homogeneous distribution in the as-extruded composites. Wear tests results showed that the wear rates of the as-extruded composites were lower than that of the solution-treated composites almost under all testing conditions and with the same SiC size and volume fraction. However, the dominant wear mechanisms for these two types of composites were different. The typical necklace-type distribution of SiC_p in the solution-treated composites could effectively promote the occurrence of delamination owing to the weak bonding between SiC_p and matrix in the particle aggregated regions. By contrast, as the bond between disperse SiC_p and matrix was enhanced, the homogeneous distribution of SiC_p in the as-extruded composites could promote the occurrence of adhesion and prevent the occurrence of delamination. Moreover, a higher applied load and higher volume fraction of SiC_p obviously promoted the progress of delamination for the solution-treated composites, while the extent of the adhesive wear for the as-extruded composites was mainly associated with the increase of the applied load, sliding velocity and SiC particle size.

Graphic abstract

中文翻译：

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量身定制SiC颗粒分布引起的SiC p / AZ91复合材料的不同摩擦学行为

摘要

在这项研究中，的磨损行为的溶液处理并作为挤出的SiC _p /具有不同尺寸和SiC粒子体积分数AZ91D金属基复合材料进行了系统的下不同的磨损测试参数的影响。SiC颗粒在固溶处理的复合材料中表现出典型的项链型分布，而在挤压后的复合材料中表现出均匀的分布。磨损测试结果表明，几乎在所有测试条件下，且具有相同的SiC尺寸和体​​积分数，挤压复合材料的磨损率均低于固溶处理的复合材料。但是，这两种复合材料的主要磨损机理是不同的。SiC _p的典型项链型分布在溶液中处理过的复合材料能有效地促进分层由于碳化硅之间的弱键合发生_p在粒子聚集区域和基质。相反，随着分散的SiC _p与基体之间的键增强，挤压后的复合材料中SiC _p的均匀分布可以促进粘结的发生并防止分层的发生。此外，较高的施加载荷和较高的SiC _p体积分数明显促进了固溶处理复合材料的分层过程，而挤出复合材料的粘着磨损程度主要与施加载荷的增加有关，滑动速度和SiC粒度。

图形摘要