Abstract
Aluminium metal matrix composites are finding increased applications in many areas. Adding of the third element to the metal matrix make the composite hybrid. This paper presents the study on the surface roughness characteristics of a hybrid aluminium metal matrix (Al6061-SiC-Al2O3) composites. The experimental studies were carried out on a lathe. The composites were prepared using the liquid metallurgy technique, in which 3, 6 and 9 wt % of particulates SiC and Al2O3 were dispersed in the base matrix. The obtained cast composites were carefully machined. The characteristics that influence the surface roughness such as feed rate, depth of cut and cutting speed were studied, which made the analysis come to a conclusion that the surface roughness is increases with the increase of feed rate and it reduces the surface roughness with the increase of cutting speed.
Highlights
Metal Matrix Composites are the newly engineered materials
Several researchers have indicated that polycrystalline diamond (PCD) tools are the only tool material that is capable of providing a useful tool life during the machining of MMCs [4]
Experiments are conducted to study the influence of cutting parameters on surface roughness in machining of hybrid metal matrix composites
Summary
Metal Matrix Composites are the newly engineered materials. Metal matrix composite consists of at least two constituent parts, of which one constituent part being a metal and the other part may be a different metal or another material, such as ceramic or organic compound. Such new class of materials are characterized by light weight, high strength and wear resistance than those of conventional materials Due to such attractive properties coupled with the ability to operate at high temperatures, hybrid MMCs compete with super-alloys, ceramics, plastics and re-designed steel parts in several aerospace and automotive applications [2]. Most of the research work studies the wear characteristics of different tool materials during machining of aluminium metal matrix composites [7]. The surface roughness of the aluminum metal matrix composite is highly influenced by the feed rate, cutting speed and volume fraction of SiC [11]. A model was developed to predict the surface roughness in precision machining of metal matrix composites using PCD tools by including the tool nose radius, size and volume of reinforcement, feed rate and depth of cut. The size of the reinforcements in the composite influences the roughness of the machined surfaces more rather than the feed rate and the tool nose radius [12]
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