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The effect of Li content (up to 4%), Cu content (up to 5%), and Mn content (up to 1·4%) on the hot~ra~king su~ceptibility of Al alloys containing Li was investigated. The usual tests, principally the measurement of crack len~th zn n~g ca~tzngs, w~re used to evaluate the hot cracking susceptibility of the alloys. The values of linear shrinkage and elongatIOn to faIlure zn.the bnttle temperature range in the solid-liquid condition were compared. An increase in Li an~Cu co~tent~nthe AI:-Cu-Ll sy~tem results in a decrease in the hot cracking susceptibility corresponding to a rise in the elongatIOn to faIlure zn the bnttle range zn t~e solid-liquid condition. The addition of Mn increases the hot cracking susceptibility associated with a decrease in elongatIOn to failure in this temperature range. MST/2009

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