An Investigation on the Sintering Behavior of High Strength Al-Zn-Mg-Cu Alloy Prepared from Elemental Powders
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.
Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim
M. Shahmohammadi et al., "An Investigation on the Sintering Behavior of High Strength Al-Zn-Mg-Cu Alloy Prepared from Elemental Powders", Materials Science Forum, Vols. 534-536, pp. 489-492, 2007