Abstract
The increased expectation of automotive, aviation and marine industries pertaining to the enhanced properties and their use in elevated temperature conditions and also corrosive environments leads to the development of the newer material to meet the requirements. The requirements of the automobile and marine applications call for the increased mechanical properties and lower density accompanied with higher resistance to oxidation. Hence the present research work is aimed at the development of Hybrid metal matrix composites (HMMCs) using low-density base material and reinforcements. The aluminum of grade LM6 is preferred material in automobile industries, because it can be cast to any complex geometry and possess good machinability, further upon heat treatment, the properties of LM6 alloy can be enhanced to meet the industry requirements. However, requirements of automobile industries consist of increased mechanical properties, lower density and higher corrosion resistance. Hence, in the present research work, it is aimed to develop newer composite material using LM 6 grade Aluminum alloy as matrix material which is reinforced with varied percent Cenosphere and Red mud.
Highlights
With the increase in the percentage of cenosphere and red mud, the density of the Hybrid metal matrix composites (HMMCs) material decreased. It is seen from the microstructural studies that there is a uniform distribution of cenosphere and Red mud in the matrix
The results of tensile test was revealed that there is a decrease in the ultimate tensile strength with the increase in cenosphere and red mud percentage
Corrosion tests revealed that as percent cenosphere increases the corrosion resistance increases up to 6% addition of cenosphere, further addition of cenosphere results in marginal weight loss of the HMMCs material for both untreated and solution heat treated
Summary
Tensile strength and percent elongation of the AA7075 grade aluminum alloy reinforced with TiC was found higher when compared to base material [15]. Increased hardness and tensile strength of the redmud reinforced aluminum metal matrix composite was observed when compared to the base material [16]. The hardness and tensile strength of aluminum hybrid metal matrix composites reinforced with cenosphere and graphite were found higher when compared to base material [17]. Heat treated and aged composites have shown higher hardness and higher ultimate strength when compared to base material [19]. Al-Mg-Si matrix containing rice husk ash and silicon carbide particles were shown improved corrosion resistant when subjected to 3.5% NaCl solution [22]. The heat treated composite material shown higher corrosion resistance when compared to untreated composite material [23]. The results of the experiments shown that when the material was subjected to overloads and corrosive environment the fatigue life reduced due to corrosion pit formation, anodic dissolution and hydrogen embrittlement [25]
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