ANALYTICAL INVESTIGATIONS OF MECHANICAL PROPERTIES OF SEMI SOLID PROCESSED ALUMINIUM 7075 ALLOY

Abstract

At present for industries it is a challenge to produce products of good quality and should have high durability. In this engineering world there is great a great need of various engineering materials to satisfy these engineering needs. The material usage mainly depends on the material strength and properties. Aluminum-7075 alloy is primarily used for transport applications, such as aerospace, maritime and automotive industries, thanks to its good mechanical properties and a low density. For the semi-solid formation of aluminium alloys, a homogenous equiased grain structure is required. The stress mediated melting mechanism is one of the approaches used to achieve such a microstructure.

The present work describes the synthesis of Al 7075 semi solid metal matrix composite reinforced with graphene and the characterization of their mechanical properties.  Graphene is added to aluminium-7075 and samples are prepared both with stirring and without stirring at varying temperatures. The samples are prepared at 680⁰c, 710⁰c, 740⁰c, 770⁰c, 800⁰c, 830⁰c, 860⁰c, 890⁰c, 920⁰c.

At these temperature the material is mostly semi-solid Aluminium 7075 and graphene is added to this semi-solid molten melt and stirred with stirrer. The specimens are prepared according to ASTM standards. The tests like hardness, tensile, impact and compression tests are performed and the values are compared. The tensile power, hardness, compression reduces as its temperature increases. The specimens are analysed using ANSYS software. The specimens with stirring has good mechanical properties than without stirring.  Graphene has good mechanical characteristics such as strength and hardness.