Affiliation:
1. Sharif University of Technology
2. Technische Universität Wien
3. Mashhad Powder Metallurgy Co.
Abstract
In the present work, the sintering behavior of high strength Al-5.6Zn-2.5Mg-1.6Cu (in
wt.%) alloy compacts was investigated. Green parts made by pressing of mixed elemental powders
were sintered at different temperatures between 400 and 600 °C. The effect of the sintering
temperature on density, dimensional change and microstructure of the Al alloy was studied.
Microstructural evaluation was accompanied by XRD and DSC methods in order to determine the
temperature and chemical composition of the liquid phases formed during sintering. It was found
that three transient liquid phases are formed at 420, 439 and 450 °C. Microstructural study revealed
the progressive formation of sintered contacts due to the presence of the liquid phases, although the
green compact expands as a result of the melt penetration along the grain boundaries. While Zn
melts at ~420 °C, the intermetallic phases between Al and Mg were found to be responsible for the
formation of liquid phase and the dimensional change at higher temperatures.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
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