Abstract
We investigated the effect of alloy composition on mechanical properties and formability of flame resistance magnesium cast alloys prepared by antigravity suction casting. It was well known that the combustion temperature of the Mg alloy is increased 200 K by the addition of 1 mass% of Ca. In addition, mechanical properties and corrosion resistance is improved adding Al to Mg alloy. In this present study, by using the various Mg cast alloy with varying Al content prepared by antigravity suction casting, and to investigate the formability, rollability and mechanical properties of the cast material, and investigated the optimal amount of Al added. The Vickers hardness and yield stress were improved with increases of the Al content, but Tensile strength and elongation were reduced Al content more than 8 mass%. In order to increase the limited reduction ratio and formability, fine dispersion of Al-Ca compounds to Mg phase is very effective, it is necessary to obtained fine initial grain size about 100 μm of the cast material. By performing a multi-pass warm and hot rolling process, the Mg phase is occurred the dynamic recrystallization and the Al-Ca compound is crashed during rolling process, the strength is improved, but, edge crack easily formed that Al content is increased.
