Aging and Mechanical Characteristics of Precipitation Hardening Stir cast Al6061 Hybrid Composite

Sharma, S S and Gowri Shankar, M C and Kini, Achutha U and Jagannath, K and Prabhu, P R (2016) Aging and Mechanical Characteristics of Precipitation Hardening Stir cast Al6061 Hybrid Composite. In: International multidisciplinary research conference, 02/02/2016, Colombo.

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This paper is an attempt to find the age hardening characteristics and tensile properties of Al6061 hybrid composites reinforced with 2 & 4% by wt. of SiC particulate and 2% by wt. of B4C particulate subjected to different aging cycle. Two step stir casting technique is adopted for fabrication of composites. The size of particulates used in the study is 35 μm. The cast matrix alloy and its composite have been subjected to solutionising treatment at a temperature of 558o C for 2 h followed by water quenching. The quenched samples are subjected to artificial aging at temperatures of 100, 150 & 200oC. Scanning Electron Microscope images show homogeneous dispersion of SiC & B4C particles in the matrix. Hardness & tensile strength have improved with increase in wt. % of reinforcement. An attempt is made to find out the Intermetallic phase responsible for strengthening by Transmission Electron Microscopy. Due to positive response to age hardening treatment there is an improvement in the mechanical properties of Al6061 alloy & its hybrid composite, i.e. increase in hardness & tensile strength. It is also observed that there is a provision to alter the mechanical properties to a greater extent and better properties can be obtained by aging at lower temperatures. The fracture surface of the tensile specimen is analyzed to reveal the probable mode of failure by Scanning Electron Microscopy. The aging kinetics is more accelerated in case of hybrid composites as compared to unreinforced Al6061 alloy because of presence of reinforcement particulate, which act as nucleation site for precipitation.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Al6061, Silicon Carbide, Boron Carbide, Age Hardening, intermetallic
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 12 Feb 2016 10:14
Last Modified: 12 Feb 2016 10:14

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