TRACKING INTERPHASES IN DIRECTIONALLY SOLIDIFIED Zn-Al BINARY

SERGIO F. GUEIJMAN ; CARLOS E. SCHVEZOV; ALICIA E. ARES

Materials Performance & Characterization

ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.

Lugar: West Conshohocken, PA, 19428-2959 USA; Año: 2012 vol. 1 p. 37 - 52

2165-3992

In the present work, we investigated the movement of the liquid interphases, eutectic interphases and solid interphases, running in a binary Zn-Al alloy system from the chilled ends of a hemicylindrical sample. We found that under specific solidification conditions, new liquid and solid interphases can be created in the center of the sample, and then move toward the ends of the probe and collide with the solidification advancing fronts. In a horizontal setup with chilled ends we determined the speeds and accelerations of the four imposed interphases, two of which moved from left to right and two of which moved from right to left. We were also able to detect the creation of new liquid, solid or eutectic interphases created near the center of the sample, and to calculate their speeds and accelerations from the near beginning of the creation to the instant in which they collided with the imposed solidification fronts.