Effect of Heating Temperature on the Microstructural Evolution of Al-5.8%Zn-1.63%Mg-2.22%Cu-0.12%Zr Gas Atomized Powders

Abstract:

Al-5.8%Zn-1.63%Mg-2.22%Cu-0.12%Zr powders were manufactured by gas atomization process. The effect of temperature on microstructural evolution of the powders was investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). On reheating the atomized powders into semisolid state, the phase chemistry and quantity of liquid were typically changed as the system established equilibrium. As the heat treated temperature was increased from 550 °C to 620 °C, the amount of η (MgZn2) phase decreases and a great number of particles Al2Cu precipitates in the powders interior. The inter-diffusion of species will be the main factor. Considering the factors of microstructure, 600 °C is determined to be the best semi-solid forming temperature.

• Periodical: Advanced Materials Research (Volumes 418-420)
• Pages: 1595-1598
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.418-420.1595
• Online since: December 2011
• Authors: Feng Xain Li, Yun Zhong Liu, Xia Luo
• Keywords: Atomized Powders, Heat Treatment, Microstructure

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