Multi objective optimization of wear characteristics on Al7075/Al2O3/B4C composites - Desirability approach
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초록
Aluminium hybrid metal matrix composites comprises of Al alloy embedded with multiple hard particulates to improve thewear characteristics. In this study Al 7075/Al2O3/B4C hybrid composite was fabricated with 5 wt.% B4C particles addition and2, 4, 6, 8 and 10 wt.% of Al2O3 by liquid metallurgy route. The dry sliding wear behaviour of hybrid composites wasinvestigated under various sliding parameters using a pin on disc tribometer. Numerical models were developed to predict thefrictional and wear characteristics of the composites. Analysis of variance method and confirmation experiments wereemployed to validate the adequacy of the developed model. The composites with high particle content exhibits better wearresistance at various sliding conditions. Detailed metallurgical investigations were carried out on the on worn surface. Thewear rate was severe at higher loads due to the crater formation and in addition to abrasive wear. The wear rate andcoefficient of friction were optimized using desirability based multi criteria optimization technique.
Abstract
Aluminium hybrid metal matrix composites comprises of Al alloy embedded with multiple hard particulates to improve thewear characteristics. In this study Al 7075/Al2O3/B4C hybrid composite was fabricated with 5 wt.% B4C particles addition and2, 4, 6, 8 and 10 wt.% of Al2O3 by liquid metallurgy route. The dry sliding wear behaviour of hybrid composites wasinvestigated under various sliding parameters using a pin on disc tribometer. Numerical models were developed to predict thefrictional and wear characteristics of the composites. Analysis of variance method and confirmation experiments wereemployed to validate the adequacy of the developed model. The composites with high particle content exhibits better wearresistance at various sliding conditions. Detailed metallurgical investigations were carried out on the on worn surface. Thewear rate was severe at higher loads due to the crater formation and in addition to abrasive wear. The wear rate andcoefficient of friction were optimized using desirability based multi criteria optimization technique.
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