MECHANICAL PROPERTIES OF HIGH STRENGTH Al-Mg ALLOY SHEET

Abstract

The aim of this research is to develop the high strength Al alloy sheet for the automotive body. For the fabrication Al - Mg alloy sheet, the composition of alloying elements was designed by the properties database and CALPHAD (Calculation Phase Diagram) approach which can predict the phases during solidification using thermodynamic database. Al - Mg alloys were designed using CALPHAD approach according to the high content of Mg with minor alloying elements. After phase predictions by CALPHAD, designed Al - Mg alloys were manufactured. Addition of Mg in Al melts were protected by dry air/Sulphur hexafluoride (SF 6 ) mixture gas which can control the severe Mg ignition and oxidation. After rolling procedure of manufactured Al - Mg alloys, mechanical properties were examined with the variation of the heat treatment conditions.