Details

Autor(en) / Beteiligte

• Gill, S C
• Zimmermann, M
• Kurz, W

Titel

Laser Resolidification of the Al--Al sub 2 Cu Eutectic: the Coupled Zone

Ist Teil von

• Acta metallurgica et materialia, 1992-11, Vol.40 (11), p.2895-2906

Erscheinungsjahr

1992

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Laser rapid solidification experiments have been performed on hypoeutectic Al--Cu alloys (26, 27 and 28 wt.%) and TEM foils have been produced by means of longitudinal cuts through the centre, or from the surface, of the laser traces. From the orientation of the microstructure present in the foils, it has been possible to relate microstructural features to local growth rate during solidification. Several growth morphologies have been observed: regular eutectics at up to approx 0.2 ms exp --1 , dendritic /cellular structures from approx 0.05-0.6 ms exp --1 and bands from approx 0.6 ms exp --1 . The transition from eutectic to dendritic structures at such velocities requires a revision to the shape of the coupled zone at large undercoolings which is, however, consistent with current theories of rapid solidification. The utility of combined rapid solidification experiments and theory for the determination of the metastable phase diagram has been demonstrated.