Abstract
Aging behavior and structure of Al-1.6wt%Li-5.7wt%Mg (Al-6at%Li-6at%Mg) alloys containing a small amount of Ag, Cu, or Zn were studied by means of hardness measurement and transmission electron microscopy, etc. These additional elements improve the age-hardenability of the ternary alloy. This effect is remarkable in the alloys containing 0.1at%Ag or 0.6at%Zn. The fact is considered to be partly due to the finer distribution of δ' phase and partly due to the enhanced precipitation of a phase analogous to T (Al2LiMg). Energy dispersive X-ray spectroscopic (EDXS) analysis on precipitates reveals that neither Mg nor additional elements are enriched in δ' phase but that they are enriched in the phase analogous to T.
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