Tensile fractography of artificially aged Al6061-B4C composites

Sharma, S S and Kini, Achutha U and Gowri Shankar, M C and Rakesh, T C and Raja, H and Chaitanya, Krishna P and Shettar, Manjunath (2018) Tensile fractography of artificially aged Al6061-B4C composites. Journal of Mechanical Engineering and Sciences, 12 (3). pp. 3866-3875. ISSN 2289-4659

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Abstract

Presence of various amount of B4C reinforcement (2, 4 & 6% wt.) in Al6061 alloy on the hardness and tensile behaviour is studied in the present work. The influence of artificial aging due to presence of reinforcement on Al6061 alloy also evaluated. Brinell hardness and failure behaviour during tensile loading which impact the growth of failure physiognomies have been confirmed. The conventional age hardening treatment at three aging temperatures (100, 150 and 200°C) is performed on the composites, peak hardness and ultimate tensile strength variations at three aging temperatures is critically analysed. Lower temperature aging shows enhancement of hardness by 170% and ultimate tensile strength by 90%. The best results obtained during peak aging at 100°C is subjected to transmission electron microscope (TEM) analysis to look into the type of intermetallic responsible to strain the matrix alloy. TEM study recognises the Mg2Si phase formation during peak aging. Precipitation of this intermetallic phase and presence of harder reinforcements leads to the enhancement of hardness and nucleation of void growth failure during artificial aging treatment

Item Type: Article
Uncontrolled Keywords: Matrix alloy; Aluminium Metal Matrix Composites; Boron carbide; aging; fractography; microstructure
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 09 Oct 2018 06:57
Last Modified: 09 Oct 2018 06:57
URI: http://eprints.manipal.edu/id/eprint/152089

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