Effect of Precipitation Hardening And Thermo Mechanical Treatments on The Characteristics of Aluminium Alloys

Sharma , S S (2012) Effect of Precipitation Hardening And Thermo Mechanical Treatments on The Characteristics of Aluminium Alloys. In: Proceedings of National Conference on Mechanical Engineering Technology, June 2, SJCET, Pal ai, India.

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Abstract

The 7XXX series AI Zn - Mg alloys are precipitation hardenable and therefore amenable for rhermornechanical treatment. AI alloys with trace elements are used in aerospace industries inspite of the drawbacks of susceptibility to stress corrosion, susceptibility to natural aging, 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 AI Zn alloys with magnesium addition I & 3 wt. % are analyzed. The cast alloys are solution treated and aged at 500C & IOOOe. 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 AI 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 therrn 0mechanically treated samples. For obtaining maximum hardness, optimum number and volume% of precipitate particles are required. The AI-5Zn-3Mg alloy shows best results.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: -AI Zn alloys, thermomechanical, hardness, age hardening, precipitation
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 14 Mar 2013 11:05
Last Modified: 14 Mar 2013 11:05
URI: http://eprints.manipal.edu/id/eprint/79051

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