Dynamical structure change during reversion above zone solvus in AlZn binary alloys

✍ Scribed by H. Okuda; K. Osamura; H. Hashizume; Y. Amemiya

• Publisher: Elsevier Science
• Year: 1988
• Weight: 796 KB
• Volume: 36
• Category: Article
• ISSN: 0001-6160
• DOI: 10.1016/0001-6160(88)90144-7

✦ Synopsis

Ah&met-Structure change during reversion process of AM.8 and t5 at.%Zn altoys above G.P. xone solvus was investigated using the in sire small-angle X-ray scattering technique. When the pm-aged alloy was held at high temperatures, the intergrated intensity decreased rapidly to vanish, indicating the resolution of G.P. zones. The reversion process could be apparently distinguished into two stages. In the first stage, the integrated intensity decreased gradually, while the radius of gyration and the interparticle distance remained almost constant. This stage was found to be mainly attributed to the compositional change inside G.P. zone, where the zone keeps sharp interface and the scaling rule for the structure factors ho&. RI the later stage, the zones shrink to dissolve into the matrix, keepmg still sharp interface. However, it was ~~~~~iy found that the radius of gyration increases because of the increasing tail of concentration gradient outside the interface of xones. The present work have been compared with those reported by Gerstenberg and Gerold [Crystu! Res. Tech. 20, 79 (1985)].