METALLURGICAL AND CORROSION CHARACTERISTICS OF LIGHTLY-CALCINED-MAGNESITE REINFORCED ALUMINIUM COMPOSITES

Abstract

In this research, aluminium 6061 matrix composites with lightly-calcined-magnesite (LCM) reinforcements at a weight fraction of 2.5%, 5% and 7.5% were prepared using the stir-casting method. The LCM grade was separated at a temperature of 1100 °C from the sintering process of a shaft kiln in refractory factories. Examination of the surface morphology of the composite samples by FE-SEM was performed. In addition, tensile, wear, and hardness tests were performed to identify their scope in industrial applications. It should be observed that the 5% wt. LCM has the greatest hardness (118.3 HV) and tensile strength (106 MPa). The 7.5% reinforcement of the LCM underwent a 51-m low wear test. The findings indicate that 5% wt. LCM composite had the greatest coefficient of friction (COF) value, which was 0.255. In an electrochemical test, a composite made of 7.5% weight LCM showed a low corrosion current of 0.0000504 A/cm² in a 3.5% aqueous NaCl solution. The findings demonstrate that the LCM particles in the Al 6061 alloy are a new blend that provide strong corrosion protection, wear characteristics, and outstanding mechanical qualities. The best performance characteristics of the composites produced are shown with the 5% reinforcing of the LCM.

Keywords

• lightly-calcined-magnesite
• al 6061 alloy, stir casting method
• metallurgical propertie
• , electrochemical corrosion