MAGNESIUM ALLOY SHEET HAVING SUPERIOR FORMABILITY AT ROOM TEMPERATURE, AND METHOD FOR MANUFACTURING SAME

摘要

The aim of the present invention to provide a magnesium alloy sheet having high formability, in which Ca is added to a Mg-Zn-based alloy which is a precipitation hardened alloy, and a twin roll strip casting process and a subsequent heat-treatment process are performed to improve precipitation behavior, thus enabling the magnesium alloy sheet to have superior strength and low anisotropy, and particularly, press formability that is remarkably improved as compared to conventional magnesium alloy sheets. To accomplish the aim, the magnesium alloy sheet having high formability according to the present invention comprises 1 to 10 wt % of Zn and 0.1 to 5 wt % of Ca, the remainder being unavoidable impurities and magnesium, wherein the magnesium alloy sheet has a limiting dome height (LDH) of 7 mm or higher.