-, Govind and Nair, K. S. and Mittal, M. C. and Sikand, R. and Gupta, A. K. (2008) Effect of extrusion parameters on microstructure and mechanical properties of ZK30 Mg alloy. Materials Science and Technology , 24 (4). pp. 399-405. ISSN 1743-2847

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Abstract

Mg alloys are the lightest structural metallic materials, and are very attractive for aerospace applications. But their applications are limited owing to their poor workability, moderate strength and poor corrosion resistance. ZK30 Mg alloy (Mg-3.0Zn-0.5Zr (wt-%)) shows better strength and workability due to the presence of fine grains than conventional Mg-Al-Zn base wrought alloys. In the present study homogenised billets of this alloy were extruded into square tubes at various temperatures and ram speeds to determine the regime of uniform deformation and best mechanical properties. Material exhibited dynamic recrystallisation under all the conditions studied. Increase in the extrusion temperature improves the homogeneity of deformation but further increase in temperature (>400 degrees C) causes abnormal grain growth. Increase in ram speed is also found to enhance uniform deformation but further increase in ram speed (>8 mm s(-1)) causes adiabatic heating and flow localisation. Based on the findings of the present study, an optimum process parameter regime was finalised for homogeneous deformation and best mechanical properties.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Maney Publishing.
Subjects:	Materials Science Metallurgy & Metallurgical Engineering
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	06 Jan 2014 09:35
Last Modified:	06 Jan 2014 09:35
URI:	http://npl.csircentral.net/id/eprint/990

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