On the discontinuous dissolution reaction in a Mg-8 wt.% Al alloy

The present studies of a Mg-8 wt.% Al alloy have shown that the discontinuo us precipitation reaction is occurring during ageing at 500 K. A subsequent dissolution heat treatment at 625 K revealed that the dissolution process occurs in the discontinuous mode by receding of the former reaction front o f the discontinuous precipitation towards the position of the original grai n boundary. The solid solution resulting from the discontinuous dissolution process is very inhomogeneous. As the theoretical calculations proved the differences in the Al content can be as large as 15 wt.%.