Microstructures et Recristallisation
J. Phys. IV 05 (1995) C3-217-C3-224
Microstructures de Solidification de Métaux et Alliages Réfractaires Elaborés dans le Tube à Chute Libre de GrenobleB. Vinet, E. Cini, S. Tournier and L. Cortella
Commissariat à l'Energie Atomique, DTA/CEREM/DEM, Section d'Etudes de la Solidification, Centre d'Etudes Nucléaires, 17 rue des Martyrs, 38054 Grenoble cedex 09, France
Undercooling experiments have been performed on refractory materials by processing in a high drop-tube. Emphasis is put on general aspects of surface and bulk microstructures of solidified droplets, including pure metals (W, Re, Ta, Mo, Nb, Ir, Zr) and alloys (W-Re, Mo-Re, Ta-Zr). It is shown that recrystallization often causes polycrystallinity. Moreover, the microstructure is closely related to undercooling amount prior solidification. The effect of secondary cooling on microstructure can also be studied by quenching the samples in solid tin at the end of free-fall.
© EDP Sciences 1995