The effect of trace element magnesium on the characteristics of age hardened and thermomechanically treated Al – Zn alloys

Sharma , S S and Prabhu, P R (2009) The effect of trace element magnesium on the characteristics of age hardened and thermomechanically treated Al – Zn alloys. In: International Conference on Advances in Mechanical Engg.(ICAME 2009, June 24-25, Shahalam, MALAYSIA.

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Abstract

Al – Zn alloys are precipitation hardenable and therefore amenable for thermomechanical treatment. Al – Zn alloys with trace elements are used in aerospace industries inspite of the drawbacks of susceptibility to stress corrosion, poor wettability, poor weldability and poor fatigue resistance. The wettability and mechanical properties are improved by the addition of a small weight percentage of magnesium. Cold deformation increases lattice defects, hence strain hardening, which inturn improves the properties of solution treated alloy. In view of this, six different Al – Zn alloys with magnesium addition 1 & 3 wt. % are analyzed. The cast alloys are solution treated and aged at 500C & 1000C. The solution treated alloys are further severely cold rolled to enhance the properties. The hardness and strength values are analyzed and compared with magnesium free Al – Zn alloys. Age hardening phenomena is accelerated due to the increased number of potential sites for precipitation. Higher peak hardness and lesser aging time are the characteristics of thermomechanically treated samples. For obtaining maximum hardness, optimum number and volume of precipitate particles are required. The Al-5Zn-3Mg alloy shows best results

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Al – Zn alloys, thermomechanical, hardness, age hardening
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 14 Mar 2013 11:17
Last Modified: 14 Mar 2013 11:17
URI: http://eprints.manipal.edu/id/eprint/79041

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