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Development of Empirical Relationships for Prediction of Mechanical and Wear Behavior of Copper Matrix Surface Composite by Friction Stir Processing Technique

Saravanakumar S., Gopalakrishnan Saravanan, Kalaiselvan K.

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 2

617--626

EN

In this investigation, Copper Matrix Surface Composites (CMSCs) were reinforced with various ceramic particles like Aluminum Nitrate (AlN), Titanium diboride (TiB2), and Rice Husk Ash (RHA) are used to increase the metallurgical and mechanical properties by Friction Stir Processing (FSP). The Design of the Experiment (DOE) Taguchi L9 orthogonal array method was used. The process parameters considered were groove width and various types of reinforcement particles. The fabrication of CMSCs was achieved by using optimized process parameters, such as the tool transverse speed of 40 mm/min, rotational tool speed of 1000 rpm, and an axial load of 10 kN with one pass. The influence of FSP process parameters on CMSCs in the stir zone is observed through optical microscope (OM), Field Emission Scanning Electron Microscope (FESEM), and Transmission Electron Microscope (TEM). Mechanical properties such as microhardness and wear rate are studied and compared. It reveals that good interfacial bonding was produced between ceramic particles in CMSCs. TiB2 reinforced with copper matrix surface composites enhance microhardness and had a lesser wear rate.

2

Laser beam welding of Ti/Al dissimilar thin sheets – a literature review

Kalaiselvan K., Elango A.

Journal of Achievements in Materials and Manufacturing Engineering

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2014

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Vol. 67, nr 1

39--44

EN

Purpose: This paper describes research results of Laser Beam Welding of Ti/Al thin sheets in which many researchers have recently performed and critically reviewed from different perspectives. Design/methodology/approach: Some of notable works in the field of laser welding with changes in mechanical properties, crack propagation, diffusion behaviour, chemical potential, interfacial reaction and the microstructure are reported. Findings: Dissimilar joining of Titanium and Aluminium thin sheets has potential applications in aerospace and automobile industry which can reduce weight and cost and improve strength, corrosion resistance and high temperature properties. Practical implications: Successful welding of Titanium/Aluminium sheets is of challenge due to differences in physical, chemical and metallurgical properties between the two. Originality/value: Interest has been shown in welding Ti/Al especially in the aviation industry in order to benefit from corrosive resistance, strength properties, low weight and cost.

3

Effect of material location and tool rotational speed on microstructure and tensile strength of dissimilar friction stir welded aluminum alloys

Dinaharan I., Kalaiselvan K., Vijay S. J., Raja P.

Archives of Civil and Mechanical Engineering

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2012

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Vol. 12, no. 4

446--454

EN

The dissimilar welding of cast and wrought aluminum alloys has high potential to expand the usage of economical castings. Friction stir welding (FSW) is an appropriate technique to join dissimilar aluminum alloys. The present work investigates the effect of material location and tool rotational speed on microstructure and tensile strength of dissimilar friction stir welded cast and wrought aluminum alloy AA6061. Eight joints were made using four tool rotational speeds by changing the location of each aluminum alloy in advancing and retreading sides. The results indicated that the material location prior to welding and tool rotational speed significantly influenced the material flow behavior. The material placed in the advancing side occupied the major portion of the weld zone when tool rotational speed was increased. The microstructure of the dissimilar joints exhibited the presence of four zones namely base metal, heat affected zone, thermomechanically affected zone and weld zone. The weld zone revealed two kinds of regions namely unmixed region and mechanically mixed region. The dissimilar joint showed maximum tensile strength when cast aluminum alloy was placed in the advancing side at all tool rotational speeds.