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Effect of Aging on Impact Fracture Behavior of 2024Al-$Al_2O_3P$ Composites Made by Casting Route

Giridhar, R and Surappa, MK (1993) Effect of Aging on Impact Fracture Behavior of 2024Al-$Al_2O_3P$ Composites Made by Casting Route. In: The Ninth International Conference on Composite Materials, 1993, pp. 219-226.

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Abstract

Instrumented impact tests were carried out on 2024Al alloy and 2024Al-10wt% $Al_2O_3P$ composites in the as-extruded and aged conditions. Fracture toughness values $(K_{Id}$ and $J_{Id})$ and the fracture energy values were computed from the impact test data. The fracture energy values give a better indication of the impact fracture behavior of the material compared to the fracture toughness values. Both the unreinforced alloy and the composite showed higher fracture energy values in the underaged condition. The fracture energy values decreased with aging and reached the minimum value in the overaged condition. SEM fractographs revealed that the mode of failure in the unreinforced alloy was a combination of shear and microvoid coalescence assisted by secondary microvoids formation along the ligaments in the overaged condition. The composites showed a transition in the failure mode from predominantly particle cracking in the underaged condition to a combination of particle cracking and particle-matrix debonding in the peak-aged and overaged condition.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to University of Zaragoza Woodhead.
Keywords: aluminium-alumina composites;effect of ageing;fracture toughness.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 30 Jun 2008
Last Modified: 27 Aug 2008 13:30
URI: http://eprints.iisc.ernet.in/id/eprint/14606

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