STRUCTURAL EVOLUTION IN Mg-Al ALLOYS

摘要

The development of a new microstructuraly stable Mg-Al alloys was performed via the CALPHAD method. It was found that precipitation of Mg_2Sn takes place as a result of the Sn presence in the alloy. The improved microhardness of the new alloy results from the combined effect of solution strengthening elements and stable phase at the grain boundaries. Al-Nd and Al-Mn-Nd intermetallics are expected to constrain grain boundary sliding during high temperature creep. The fine precipitation of Mg_2Sn can hinder dislocation creep. The CALPHAD method was found to be consistent with experimental results.