Effect of Heat Treatment on Mechanical and Tribological Properties of Centrifugally Cast Functionally Graded Cu/Al2O3 Composite

[+] Author and Article Information
Manu Sam

Department of Mechanical Engineering, Amrita School of Engineering, Coimbatore, Amrita Vishwa Vidyapeetham, Amrita University, India

N Radhika

Department of Mechanical Engineering, Amrita School of Engineering, Coimbatore; Amrita Vishwa Vidyapeetham, Amrita University, India

1Corresponding author.

ASME doi:10.1115/1.4037767 History: Received April 26, 2017; Revised August 02, 2017


A Functionally graded Cu-10Sn-5Ni metal matrix composite reinforced with 10 wt% of Al2O3 particles was fabricated using the centrifugal casting process with dimension Fout100 x Fin85 x 100 mm. The mechanical and wear resistance of the composite has been enhanced through heat treatment. Samples from of the inner zone (9-15mm) were considered for heat treatment, as this zone has higher concentration of less dense hard reinforcement particles. The samples were solutionised (6200C / 60mins) and water quenched followed by aging at different temperatures (400,450 and 5500C) and time (1, 2 and 3hrs). Optimum parametric combination (4500C, 3 hrs) with maximum hardness (269HV) was considered for further analysis. Dry sliding wear experiments were conducted based on Taguchi's L27 array using parameters such as applied loads (10, 20 and 30 N), sliding distances (500, 1000 and 1500 m) and sliding velocities (1, 2 and 3 m/s). Results revealed that wear rate increased with load and distance whereas it decreased initially and then increased with velocity. Optimum condition for maximum wear resistance was determined using Signal-to-Noise ratio. Analysis of Variance predicted the major influential parameter as load, followed by velocity and distance. Scanning Electron Microscope analysis of worn surfaces predicted the wear mechanism; observing more delamination due to increase in contact patch when applied load increased. Results infer 8% increase in hardness after heat treatment, making it suitable for load bearing applications.

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