What is it about?
Aluminum alloys have increased their use due to the properties such as low density, resistance to corrosion under environmental conditions and mechanical properties. In this work, the alloying elements are immiscible promoting dendrites formation with different phases attributed to zinc and tin. The applied mechanical stresses promoted the modification of the dendrite sizes (interdendritic space) as well as pore sizes and shapes. The microhardness decreased in the ternary Al-Zn-Sn alloy with a subsequent increase caused by microstructural changes after cold work. By XPS, the metallic elements were detected with an aluminum oxide layer.
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Why is it important?
An aluminum base alloy is shown with the incorporation of Zn and Sn (5% wt) generating a dendritic type microstructure with the formation of presumably secondary phases of Sn and Zn. Loads of 49000 N and 68600 N were applied to promote cold mechanical deformation. Microstructure and microhardness studies were performed to establish the correlation between them.
Perspectives
The incorporation of Zn and Sn to Al increases the hardness of the alloy with the formation of two identified phases. It was possible to evidence the existence of the three main elements conforming the alloy using XPS. However, the exact chemical composition presents complications considering the area of analysis. This leads to the approach of alternate forms of determination of chemical composition. It is possible to appreciate the formation of structures with greater compaction by reducing intergranular space and grain growth during cold deformation. The results show feasible changes in the mechanical properties that may show to be useful in some applications.
Dr. JOSE DE JESUS PEREZ BUENO
Centro de Investigación y Desarrollo Tecnológico en Electroquímica, S.C.
Read the Original
This page is a summary of: Modification of the Al0.9Zn0.05Sn0.05 Alloy Microstructure by Cold Working and Chemical Composition, MRS Advances, December 2017, Cambridge University Press,
DOI: 10.1557/adv.2017.610.
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