Abstract
In this paper aluminum (LM25) alloy was chosen as a base matrix metal, and it was reinforced with 0, 3, 6, 9, 12% of Zirconium dioxide (ZrO2) particulates based on weight fraction method. Stir casting method was used to cast LM25/ZrO2 composite material. The cast samples were subjected to physical and mechanical test viz, density, hardness, tensile, compression and impact test. The feasibility trial weld was carried out on the developed composite (similar metals) using Friction welding process (FSW) and then welded sample were prepared for the various test. The welded samples were subjected to various mechanical tests such as tensile, hardness and bend test to evaluate the strength of the friction welded joints. Then welded samples were also subjected to optical microscopy analysis to evaluate microstructures of the base and the weld regions. The tensile, hardness, compression and impact strength increases with increase in the percentage of ZrO2 in LM25 alloy. The tensile, hardness and bending strength were high in the welded zone. The microstructures of the welded tensile tested specimen were analyzed using the Scanning Electron Microscopy (SEM) in a different region of the welded area. From the above results shows weldability of LM25/ZrO2 composites was improved with the increase in weight percentage of ZrO2 reinforcement.
Highlights
Metal matrix composites have been studied for some year, and their potential advantages over conventional monolithic alloys are increasingly being appreciated
In this work LM25 was selected as matrix materials for this investigation and it was reinforced with various weight percentages of ZrO2, in order to overcome failure due to wear for the wide application in automobile and aircraft industries
3.1 Mechanical test results for LM25-ZrO2 composites This section mainly illustrates and discusses in details about the various results obtained from mechanical testing of the developed composites
Summary
Metal matrix composites have been studied for some year, and their potential advantages over conventional monolithic alloys are increasingly being appreciated. The addition of a ceramic reinforcement phase in monolithic metal alloys significantly alters their mechanical and physical properties, as well as their deformation behavior [5]. They are usually reinforced by Al2O3, SiC, C in addition SiO2, B, BN, B4 C may be considered in the last few decades [6]. Many researchers attempted to join AMCs using established fusion welding processes They reported the presence of porosity, coarse microstructure, segregation and decomposition of ceramic particle and formation of several brittle intermetallic compounds [8]. Mechanical and microstructure analysis was carried out for joining of LM25/ZrO2 composites by rotational friction is investigated
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