Abstract
An X-ray study has been made of the structures formed during the aging of Mg-12 wt%Ag, with the following results: G.P.[1] is formed by room temperature aging for a long time (more than 600 days), and it disperses at the aging temperature higher than 60°C, while, G.P.[2] is formed by aging at room temperature, 60°C, and 100°C, and this may have some effect on the formation of the following precipitates. At the aging temperature higher than 150°, the intermediate state, γ′ phase, is firstly formed, followed by the precipitation of a stable γ phase. With the prolonged aging, the γ′ phase vanishes and yet the γ phase grows continually. The early precipitates of γ′ phase are considered to be platelike and parallel to (0001) as well as to {11\bar20} planes of the matrix.
