Abstract
Many reports on the high strength and grain refinement of the flame-resistance Mg alloy has been obtained in thin rolled sheet, but there is little report of rolled plate (thickness of 3 mm) the fabrication process in order to achieve both high strength and large elongation. In development of high strength magnesium alloys with large elongation for medium plate, effect of calcium containing of magnesium alloy and rolling process on mechanical properties of rolled Mg-Al-Zn-Ca alloys with thickness of 3 mm were investigated used by rapid cooling cast materials. In this study, to prepare a flame-resistance Mg-Al-Zn-Ca cast material, have been developed in the sheet thickness 3 mm with strength of 340 MPa and large elongation of 11.1% by hot rolling process. The cast material crystal structure is coarse as a starting material, to a total reduction in thickness about 60% strength is significantly improved, but also to further increase the reduction in thickness was strength slightly increased. The hot rolled sheet shows intensively deformed band or shear band structures, as well as finely and crushed Al_2Ca compounds during rolling process.
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