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Experimental Investigation of Microstructure, Mechanical and Wear Characteristics of Cu-Ni/ZrC Composites Synthesized through Friction Stir Processing

Velmurugan T., Subramanian R., Priyadharshini G. Suganya, Raghu R.

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 2

565--574

EN

Friction Stir Process (FSP) was employed to develop Cupro-Nickel/Zirconium Carbide (Cu-Ni/ZrC) surface composites. Five different groove widths ranging from 0 to 1.4 mm were made in CuNi alloy plate to incorporate different ZrC volume fraction (0, 6, 12, 18 and 24 %) to study its influence on the structure and properties of Cu-Ni/ZrC composite. Processing was performed at a Tool Rotational Speed (TRS) of 1300 rpm, Tool Traverse Speed (TTS) of 40 mm/min with a constant axial load of 6 KN. The study is performed to analyse the influence of ZrC particles and the volume fraction of ZrC particles on the microstructural evolution, microhardness, mechanical properties, and tribological characteristics of the Cu-Ni/ZrC composite. The fracture and worn-out surfaces are analysed using Field Emission Scanning Electron Microscope (FESEM) to identify the fracture and wear mechanisms. The results demonstrated a simultaneous increase in microhardness and tensile strength of the developed composite because of grain refinement, uniform dispersion, and excellent bonding of ZrC with the matrix. Besides, the wear resistance increases with increase in volume fraction of ZrC particles in the composite. The surface morphology analysis revealed that the wear mechanism transits from severe wear regime to mild wear regime with increase in volume fraction of ZrC particles.

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Synthesis and Characterization of Functionally Graded Al-6Cr-Y2O3 Composites

Satish Kumar T., Krishna Kumar K., Shalini S., Subramanian R.

Archives of Metallurgy and Materials

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2018

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Vol. 63, iss. 4

1649--1655

EN

The present investigation aims at fabricating a functionally graded Al-6Cr-Y2O3 composite and its microstructural and property characterization. Al-6Cr-alloys with varying percentage of Y2O3 (5-10 vol. %) have been used to fabricate FGM by powder metallurgy route. The samples were subsequently subjected to solution treatment at 610°C for 4h followed by artificially aged at 310°C for 4h. The microstructure, hardness and wear behavior of these FGM have been evaluated. FGM exhibited superior hardness (360 ± 5 VHN) as compared to the unprocessed composites (220 ± 5 VHN) due to the uniform dispersion of Y2O3 particles. Wear resistance of Al-6Cr-10Y2O3 FGM were compared that of with pure Al-6Cr alloy by dry abrasive wear test. Al-6Cr-10Y2O3 FGM composites were found to exhibit higher wear resistance with the minimum wear rate of 0.009 mm3/m compared to the Al-6Cr alloy wear rate 0.02 mm3/m.

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Dry sliding wear behavior of Al2219/SiCp metal matrix composites

Basavarajappa S., Chandramohan G., Subramanian R., Chandrasekar A.

Materials Science Poland

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2006

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Vol. 24, No. 2/1

357--366

EN

The present study deals with investigations relating to dry sliding wear behaviour of Al 2219 alloy, reinforced with SiC particles of 0-15 weight percent in steps of 5. The unlubricated pin-on disc tests were conducted to examine the wear behavior of the aluminium alloy and its composites. The tests were conducted at varying load from 0 to 60 N and sliding speed of 1.53m/s, 3m/s 4.6m/s and 6.1m/s for a constant sliding distance of 5000 meters. The result showed that wear rates of the composites are lower than that of the matrix alloy and further decreased with the increase in SiCp content. As the load increases further cracking of SiCp particle occurs and a combination of abrasion, delamination and adhesive wear were observed. The samples were examined using scanning electronic microscope after wear testing and analyzed.