Laser rapid solidification of AlCu alloys: banded and plane front growth
1993; Elsevier BV; Volume: 173; Issue: 1-2 Linguagem: Inglês
10.1016/0921-5093(93)90239-b
ISSN1873-4936
Autores Tópico(s)nanoparticles nucleation surface interactions
ResumoLaser rapid solidification experiments have been performed on AlCu alloys with compositions of up to 44 wt.% Cu. By taking thin foils from the surface of the laser traces it has been possible to study the resulting growth morphologies using transmission electron microscopy, and because the microstructural orientation follows the direction of heat flux the morphologies can be related to their local growth velocities. Transitions to banded and plane front growth have been observed at the highest growth velocities (approximately 2.0 m s−1) that are attainable with the particular experimental arrangement. These transitions are consistent with current solidification models, which do, however, require a knowledge of metastable phase equilibria. The metastable azeotrope predicted by the phase diagram calculation is show to explain the important experimental observations.
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