Abstract
In the present day engineering design and development activities many Scientists, Researchers and Engineers are striving hard to develop new and better engineering materials, which accomplishes high strength, low weight and energy efficient materials since the problems of environment and energy are major threshold areas. The development of new materials is growing day by day to replace the conventional materials in aerospace, marine engineering, automobile engineering industries etc., Hence, composite materials are found to be an alternative. A variety of metals and their alloys such as Aluminum, Magnesium and Titanium are comprehensively used as matrix materials. Among these Aluminium alloys have been used extensively, because of their excellent strength, low density, corrosion resistance and toughness. Similarly, many researchers have attempted to develop aluminum based metal matrix composites using different reinforcements such as SiC, Al2O3, B4C, TiC, TiO2, B4C etc., are added to the matrix to get required MMC’s. Among these reinforcements, B4C emerged as an exceptional reinforcement due to its high strength to density ratio, possesses high hardness and avoid the formation of interfacial reaction products with aluminum. Hence, in this paper attempts are made to fabricate Al 6061-3, 6, 9 and 12 wt.% B4C metal matrix composites by stir casting process to study fatigue life and fracture toughness as per ASTM standards. It is evident that fatigue strength and fracture toughness of the composites were enhanced with the addition of the wt.% of the reinforcement.
Highlights
In the present day engineering design and development activates many researchers are working towards the development of new materials to replace the conventional materials and found that composite materials are an alternative because to its high strength-to-weight ratio, higher stiffness, better fatigue, wear and corrosive resistance
A series of fatigue tests were conducted on Al 6061 and different wt. of % B4C composites as per ASTM E606 standard to determine fatigue strength and number of cycles of failure
Increase in the fracture toughness attributed to the uniform distribution, formation of fine particles during casting process, strong interfacial mechanism developed between matrix and the reinforcement, interaction of B4C particles with a crack tip forms residual thermal stress which block the initiation of internal cracks in the composites due to these reasons Crack Opening Displacement (COD) decreases with increase in wt.% of B4C reinforcement
Summary
In the present day engineering design and development activates many researchers are working towards the development of new materials to replace the conventional materials and found that composite materials are an alternative because to its high strength-to-weight ratio, higher stiffness, better fatigue, wear and corrosive resistance. Variety of aluminium alloys and different reinforcements such as SiC, B4C, TiC, TiO2, B4C etc. Are comprehensively used to develop Aluminium Matrix Composites (AMC’s) for aerospace, automobile marine and lightweight engineering applications. Inclusion of SiC, B4C, TiC, TiO2, B4C etc., reinforcements and soft lubricants into aluminum alloy to increase AMCs’ fatigue life and fracture strength [3]. In this paper attempts are made to develop Al6061B4C AMC’s by varying 3, 6, 9 and 12 wt.% B4C to study the fatigue life and fracture strength as per ASTM standards
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