Influence of beryllium and rare earth additions on ignition-proof magnesium alloys

A kind of magnesium alloy which has excellent ignition-proof performance an d approximate chemical composition with AZ91D alloy was obtained by berylli um and rare earth (RE) addition. A high content of beryllium in magnesium a lloy could prevent the ignition of the magnesium, but it also makes the gra in coarse and decreases the tensile properties. RE elements were added to r efine the grains and improve the tensile strength to the level of AZ91D. On the other hand, casting properties such as fluidity and hot-tearing proper ty were better than those of AZ91D alloy. (C) 2001 Elsevier Science B,V. Al l rights reserved.