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http://dx.doi.org/10.17958/ksmt.20.6.201812.818

Characterization of Extrusion Parts for after Pre-aging Treatment in an Al-4.8Zn-1.3Mg Alloy  

Lee, Chang-Yeon (DaejooKores Company)
Publication Information
Journal of the Korean Society of Mechanical Technology / v.20, no.6, 2018 , pp. 818-823 More about this Journal
Abstract
In this study, the effect of pre-aging treatment for inhibition of natural aging of Al-4.8Zn-1.3Mg alloy by extrusion process was investigated. Firstly, the as-cast microstructure of Al-4.8Zn-1.3Mg alloy billet and its evolution during homogenization($460^{\circ}C$, $4h+510^{\circ}C$, 5h) were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), hardness analysis. The as-cast microstructures of Al-4.8Zn-1.3Mg alloy reveal $Mg_2Zn$, $Al_5Cu$, $Al_{13}Cu$ formed between dendrities. After homogenization, MgZn, $Al_4Cu$, $Al_{13}Cu$ phases precipitated into the matrix. In addition, standard deviation of homogenized billet was improved than as-cast billet from 2.62 to 0.99. According to pre-aging($100^{\circ}C$, 1h) Al-4.8Zn-1.3Mg alloy by extrusion process, yield strength and tensile strength deviation improved more than condition by natural aging.
Keywords
Aluminum Alloy; Extrusion; Homogenization; Heat Treatment; Microstructure;
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