MAGNESIUM ALLOY FOR HIGH SPEED EXTRUSION AND HIGH SPEED EXTRUSION METHOD USING THE SAME

摘要

The present invention relates to bismuth (Bi) in an amount of 3.0 to 7.0% by weight; 1.0 to 5.0% by weight of aluminum (Al); Magnesium (Mg) balance; And a magnesium alloy for high-speed extrusion containing unavoidable impurities and a magnesium alloy for high-speed extrusion using the same. A magnesium alloy with a healthy surface can be produced without hot cracking even under high-speed (exit speed 40 ~ 80 m/min) extrusion conditions. As a result, the high-speed extrusion method according to the present invention is AZ80 (Mg-8Al-0.5Zn), AZ91 (Mg-9Al-1Zn), ZK60 (Mg-6Zn-0.5Zr), etc., can produce extruded material at a speed more than 10 times higher than that of commercial high-alloy magnesium alloys, greatly reducing productivity and manufacturing cost, making it an excellent choice for mass production of magnesium alloy extrusions. It can be used in a very useful way.