Effect of Some Manfacturing Parameters on Machining of Extruded Al-Al₂O₃ Composites

Abstract

A wide range of particulate metal matrix composites (PMMCs) of alumina and aluminum powders was formed using powder metallurgy techniques followed by extrusions at various extrusion ratios. The machining characteristics of the extruded PMMC were investigated. Results showed significant effects of weight fractions of reinforcement and extrusion ratios on tool wear and surface integrity of machined surface. The wear rate of cutting tool decreased rapidly with increasing the cutting parameters: cutting speed, feed, and depth of cut, however cutting speed is shown to be more effective. Sudden breakage of tool inserts occurred when the experiment started at high cutting speed. Wear rate has also decreased by decreasing volume fraction of reinforcement particles. Coating carbide tools have significantly improved the tool life. Coated tools showed 5% decrease in flank wear size compared to uncoated tools. This was valid within tested range of weight fractions and extrusion ratios. The surface finish of machined surfaces deteriorated when coated carbide tools were used. However, surface finish did not change significantly when volume fractions or extrusion ratios were altered.

Fabrication and evaluation of tribological properties of Al2O3 coated Ag reinforced copper matrix nanocomposite by mechanical alloying

“…They presented that the increasing of Al 2 O 3 nanoparticles to copper matrix enhance, wear resistance, and microhardness. Additionally, they concluded that the wear resistance and microhardness are enhanced by the addition of increasing Al 2 O 3 weight fraction [43,44]. Since mechanical alloying is high energy milling process, numerous number of milling parameters can influence the process [45].…”

Influence of Machining Parameter on Tool Life While Machining Hybrid Metal Matrix Composites

“…However, use of the coated inserts reduces too wear and hence increases productivity [21] [22] [23]. Further, use of PCD inserts results superior surface texture and increases productivity [24] [25].…”

Investigation of mechanical properties of nanostructured Al-SiC composite manufactured by accumulative roll bonding

“…A high specific stiffness and strength are the most important properties of aluminum alloys strengthened and reinforced with ceramic particulates. [1][2][3] Al-metal matrix composites (MMCs) with previous properties can be used in long-term applications, such as robots, aerospace, automotive engine, high-speed machinery, high-speed rotating shafts and metals reflect microwaves, in which saving weight is an important feature. [4][5][6] Methods of fabrication of MMCs can be divided into two main sets: (a) solid state methods (such as, mechanical milling, powder metallurgy, etc.)…”