Magnesium alloy - contg addns of bismuth and tin to minimise cracking

摘要

Magnesium alloy for cast articles which do not suffer from crack formation during casting, contain 3-10 wt. % Al, 3.3-2% Zn, and 0.1-0.4% Bi or Sn. For alloys contg. Bi, the Al-content is 75-10, pref. 75-10 wt. %. Spec. the alloy contains 0.2-0.3% Bi or Sn and opt. up to 0.5 wt.% each of Mn, Si and Cr. The addn. of Bi and/or Sn reduces the tendency for crack formation in ingots at temp. at the liquid/solid interface, and the set up of internal stresses in the castings.