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Thermal cycling behaviour of the magnesium alloy based hybrid composites in the transverse direction

Kumar, Subodh and Dieringa, Hajo and Kainer, Karl-Ulrich (2007) Thermal cycling behaviour of the magnesium alloy based hybrid composites in the transverse direction. In: Materials Science and Engineering: A, 454-45 . pp. 367-370.

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Abstract

The thermal cycling behaviour of a creep-resistant AE42 alloy reinforced with 20 vol% saffil short fibre as well as various volume fractions of saffil short fibre and SiC particulate has been examined in the transverse direction in the temperature range of $30 - 350^oC$. For comparison, the thermal cycling behaviour of the unreinforced AE42 alloy is also examined. It is found that the linear instantaneous CTE curves of composites show a positive deviation from linearity above $215 - 230^oC$, which is attributed to the release of residual compressive strain arising from the squeeze casting process. The experimentally obtained CTE of the composites is compared with the theoretically calculated values. The CTE of the hybrid composite is calculated by a linear subtraction of the expected decrease in CTE with the addition of SiC particulates from the CTE calculated for composite containing short fibres alone assuming a rule of mixture. However, it is observed that the fibres and particulates interact in a more complex manner and the decrease in CTE with the addition of particulates in a hybrid composite is greater than that obtained by the simple linear subtraction assuming a rule of mixture.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Hybrid;Metal matrix composites;Thermal cycling; Hysteresis;Residual strain;Coefficient of thermal expansion
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 03 Aug 2007
Last Modified: 19 Sep 2010 04:38
URI: http://eprints.iisc.ernet.in/id/eprint/11635

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