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Development of cast magnesium alloys

【Summary Description】The first stage資吃 is a basic stage in which商家 aluminum and zinc are m費黃ainly added to magn還人esium, namely Mg-A1-Zn seri飛北es alloys. The tensile strength of th拍風ese alloys is simil煙習ar to that of cast aluminium allo線暗ys.

Casting magnesium alloy can be rou和刀ghly divided into three stages:

(1) The first stage is a basic sta科議ge in which alumin書學um and zinc are mainl嗎志y added to magnesium, namely Mg-A1-Zn員西 series alloys. The tensile strengt離雜h of these alloys is similar to that舞呢 of cast aluminium alloy風中s. ZM5 in China, L121 in the放快 UK and AM80A in the US all belong t爸遠o this kind of alloy. The main adde城不d element is aluminum, and the吃能 content of zinc is low, mainly beca答理use when the content of zinc i微信ncreases, it is easy to appear 湖身microscopic porosity.

(2) The second stage is an improvemen在窗t stage in which zirconi謝議um is added to mag玩聽nesium. Common zirconia-雨吃containing alloys in服妹clude Mg-Zn-Zr, Mg-RE-事雜Zr, etc. The main function來在 of zirconium in magn訊還esium alloy is to refine the grain, so 件民as to improve the yi北討eld strength of magnesium alloy, 雜街and make the magne村美sium alloy have good fatigue resistan藍但ce and low notch sensitivity. Th分火e disadvantage is still麗什 because the crystallization interval家購 is wide, easy to草房 appear microporous and hot c通公racking tendency. There科村fore, the zirconium森門 free die casting magnesium al道跳loy Mg-Al is the most widely used. In a近自ddition, in order to 員的improve the creep resistance of magnesi商還um alloys at high t還哥emperature, magnesium al吃老loys with rare earth ele雜吧ments as main components are prod一子uced.

(3) The third stage風的 is to add silver into the magnesiu討可m alloy in the lifting stage. Sil校少ver alloying can村如 enhance the aging stre村市ngthening effect, greatly impr冷道ove the high temp理長erature strength and cre門吧ep resistance of the magnesium alloy, 技睡but reduce the corrosion resistanc司慢e of the alloy.