Abstract
The dissolution and growth of the precipitates β′ in an Al-1.0 wt%Mg2Si alloy at 350°C has been investigated by the electron microscopic observation and electrical resistivity measurement.
As the precipitates β′ dissolve partly into the matrix at 350°C, a number of dislocations and loops were observed around the growing precipitates β′: At the same time, the stable phase β nucleated at the interface of the growing precipitates.
The electrical resistivity increased with the dissolution of β′ and was subsequently followed by the monotonous decrease due to the growth of β′.
The kinetics of the growth of β′ and the origin of dislocations and loops are discussed.
