Analytical electron microscopy and X-ray diffraction techniques have been used to study the amorphization process of the Ti-Al system induced by mechanical alloying. The results show that the entire transformation develops from the diffusion of Al into the Ti crystal lattice, beginning as soon as a well-developed layered structure is formed in the powders in the early milling stages (after 6 h). Collapse of the highly distorted host lattice occurs after milling for 20 h and gives rise to a homogeneous amorphous structure at 24 h. Further milling time (34 h) produces an f.c.c. nanocrystalline phase with a Ti-Al at. ratio of approximately 3 and with the lattice parameter a=0.42 nm.
LATTICE DESTABILIZATION AND AMORPHIZATION BY MECHANICAL ALLOYING IN THE TI-AL SYSTEM / Bonetti, E; Valdre, G; Enzo, Stefano; Cocco, G.. - In: JOURNAL OF ALLOYS AND COMPOUNDS. - ISSN 0925-8388. - 194:2(1993), pp. 331-338. [10.1016/0925-8388(93)90019-J]
LATTICE DESTABILIZATION AND AMORPHIZATION BY MECHANICAL ALLOYING IN THE TI-AL SYSTEM
ENZO, Stefano;
1993-01-01
Abstract
Analytical electron microscopy and X-ray diffraction techniques have been used to study the amorphization process of the Ti-Al system induced by mechanical alloying. The results show that the entire transformation develops from the diffusion of Al into the Ti crystal lattice, beginning as soon as a well-developed layered structure is formed in the powders in the early milling stages (after 6 h). Collapse of the highly distorted host lattice occurs after milling for 20 h and gives rise to a homogeneous amorphous structure at 24 h. Further milling time (34 h) produces an f.c.c. nanocrystalline phase with a Ti-Al at. ratio of approximately 3 and with the lattice parameter a=0.42 nm.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
