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Effect of Li addition on microstructure and mechanical properties of Al – Mg – Si alloy by Shamas ud Din; Hasan Bin Awais; Naeem ul Haq Tariq; Mazhar Mehmood is a Engineering article available to read on EtoBox.

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Effect of Li addition on microstructure and mechanical properties of Al-Mg-Si alloy The ever increasing utilization of Al -Li alloys for light weight structural applications is limited chiefly due to their lower room temperature formability compared to their Lifree counterparts. In the present work, the effect of 1, 2 and 3 wt.% Li addition to Al -Mg -Si alloy (containing 0.5 wt.% Mg and 0.2 wt.% Si) was studied. Experimental work showed that microstructural features of the second phase particles and mechanical properties changed substantially with Li addition. It was observed that 1 wt.% Li addition resulted in significantly large elongation of over 38 % resembling a super-plastic behavior with decent strength and hardness due to the formation of second phase precipitates uniformly dispersed in a (Al) matrix. Scanning electron microscopy and X-ray diffraction analysis revealed that the addition of Li promotes the formation of second phase precipitates, which strongly affect the mechanical properties of Al -Mg -Si alloy. Quite surprisingly, the alloys containing 2 and 3 wt.% Li showed a much reduced ductility and a much higher hardness after aging.

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Author

Shamas ud Din; Hasan Bin Awais; Naeem ul Haq Tariq; Mazhar Mehmood

Publisher

Walter de Gruyter GmbH

Published

2014

Language

EN

Field

Engineering (Physical Sciences)