Enhancement of abrasive wear resistance in consolidated Al matrix composites via extrusion process
Enhancement of abrasive wear resistance in consolidated Al matrix composites via extrusion process
复制标题
DOI：
10.1179/1751584x13y.0000000034
复制
发表时间：
2013-09
期刊：
影响因子：
--
通讯作者：
M R Rahimipour;A. Tofigh;A. Mazahery;M. Shabani
中科院分区：
文献类型：
--
作者：
M R Rahimipour;A. Tofigh;A. Mazahery;M. Shabani
研究了铝基复合材料在不同滑动速度和载荷作用下的干磨损行为。在干滑动条件下，基体合金和复合材料的摩擦系数值在轻金属的预期范围内。较高的摩擦系数是硬SiC颗粒和对置体材料之间建立的接触的结果。复合材料的磨损表面与未增强的铝合金相似，存在粗糙区和光滑区。当施加的比载荷大于临界值时，材料发生塑性变形。滑动表面上的高剪切应力导致表面下裂纹的产生和扩展，导致磨损表面的材料以薄片形式损失。在低磨损率下的复合材料的碎屑包括细颗粒和小的有光泽的金属板状薄片的混合物，并且与接触表面上更多的富铁层的形成相关联。
The present study addresses the dry wear behaviour of aluminium matrix composites under different sliding speeds and applied loads. Values of the friction coefficient of the matrix alloy and composite materials were in expected range for light metals in dry sliding conditions. The higher coefficient of friction was the consequence of established contact between hard SiC particles and the counter body material. The rough and smooth regions are distinguished on the worn surface of the composites similar to the unreinforced Al alloy. Plastic deformation occurred when the applied specific load was higher than the critical value. The high shear stresses on the sliding surface cause initiation and propagation of the cracks in the subsurface, leading to the loss of material from the worn surface in the form of flakes. The debrises of the composites at low wear rate comprise a mixture of the fine particles and small shiny metallic plate-like flakes and are associated with the formation of more iron rich layers on the contact surfaces.