Title of article :
Evolution of a metastable FCC solid solution during sputter deposition of TiAlB alloys
Author/Authors :
Stephan and Lِfvander، نويسنده , , J.P.A. and Dary، نويسنده , , F.-C. and Ruschewitz، نويسنده , , U. and Levi، نويسنده , , C.G.، نويسنده ,
Pages :
5
From page :
188
To page :
192
Abstract :
The microstructure evolution of a nominally αTi7Al7B alloy synthesized by sputter deposition has been examined. A highly supersaturated metastable single phase solid solution with a face centered cubic structure was identified as being the only phase present in the as-sputtered material. In contrast, Ti7Al and Ti7B alloys sputtered under the same conditions were also single phase but exhibited the expected hexagonal structure of α-Ti. The selection of the fee phase is based solely on kinetics, as the thermodynamically favored phase is always α (hcp). The reasons for the kinetic bias, however, are not clear. Annealing of the Ti7Al7B sputtered film at 900 °C for 1 h yielded precipitation of nano-scale TiB dispersoids in a single phase α-Ti matrix. Preliminary hardness and microstructural stability results of the dispersion unveiled promising potential for use of the physical vapor deposition technique to deposit TiB strengthened Ti-matrices on fibers in high-temperature metal matrix composites.
Keywords :
Microstructure evolution , Ti?Al?B alloys , Sputter deposition
Journal title :
Astroparticle Physics
Record number :
2049818
Link To Document :
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