Microstructural Evaluation of a Zn-Al-Ag Alloy
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.662
Microstructural Evaluation of a Zn-Al-Ag Alloy J. Beltrán-González1, G. Carbajal de la Torre1, A. Ruiz2, M.A. Espinosa Medina1,* 1
Facultad de Ingeniería Mecánica, Universidad Michoacana de San Nicolás de Hidalgo, C.P. 58000, Morelia, Michoacán, México.
2
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, C.P. 58000, Morelia, Michoacán, México.
*Corresponding author: [email protected]
ABSTRACT
In this study, the microstructural characterization of a superplastic Zn-Al-Ag alloy (72, 24, and 4 in % wt. respectively) by using spectroscopy analysis techniques was obtained. The XRay Fluorescence (XRF), Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) techniques were used. The main objective of this alloy development is to improve its superplasticity property and increases its corrosion resistance in acid rain environments. The effect of small grain microstructure of the alloy obtained at the end of the fabrication process improved the super-plasticity behavior. The result of the fabrication process was observed by the characterization of crystallographic phases (morphology, size and distribution) and the chemical composition. The obtained results by XRF shown that Zn was the higher proportion element, in addition the Ag (4% wt.) addition to Zn-Al base alloy improves the grain refinement, as was observed by the SEM characterization. The Ag3Al and AgZn3 intermetallic compounds homogeneously dispersed were observed in the microstructure of the Zn-Al solid solution phase. The size grain observed after the rolling process was less than 10 µm, and it was associated to one of the main characteristics of super-plasticity properties. The XRD analysis results corroborated the present phases in the alloy, as was identified with the SEM and EDS characterization.
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INTRODUCTION Currently, the innovation about lighter alloy, as Al and Mg alloys, has opened the door to be potentially applied in the aeronautics and space industries. Therefore, is necessary to find out the physicochemical and mechanical properties of those alloys. The microstructural and chemical characterization using electron microscopy, EDS and XRay equipment between others, gives relevant information of alloy conformation. The Zn-Al-Ag eutectoid alloy was development initially in the Institute of Materials Research of the UNAM [1]; since, diverse researching about this alloy have been done. Superplasticity is one of the mean characteristics of the Zn-Al alloy [2], but the addition of Ag between 1 to 4% wt. to the base Zn-Al eutectoid alloy improves the superplasticity and mechanical properties due the microstructure changes of the alloy. The additions of Ag
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