Intra-granular alpha precipitation in Ti–Nb–Zr–Ta biomedical alloys.
In: Journal of Materials Science, Jg. 44 (2009-02-01), Heft 3, S. 808-815
Online
academicJournal
Zugriff:
This article investigates the intra-granular precipitation of nanometer-scale α platelets in the β matrix of a complex quaternary β titanium alloy, Ti-35Nb-7Zr-5Ta (all in wt%), for orthopedic implant applications, during β-solutionizing/quenching/aging type heat-treatments. The role of metastable ω precipitates on the nucleation and growth of these α precipitates, has been specifically addressed by coupling transmission electron microscopy (TEM) and 3D atom probe (3DAP) tomography studies on this alloy. Athermal ω precipitates form in this alloy on quenching from above the β-transus temperature. On isothermal annealing at low temperatures (~400 °C), these ω precipitates coarsen, rejecting Zr into the adjacent β matrix as determined by 3DAP studies. Concurrently, the nucleation and growth of α precipitates is initiated at or near the ω/β interfaces, as determined by TEM studies. In addition to coherency strains induced by the ω precipitates, the local enrichment of Zr adjacent to these precipitates appears to play an important role in aiding the nucleation and growth of Zr-rich α precipitates in this alloy. [ABSTRACT FROM AUTHOR]
Titel: |
Intra-granular alpha precipitation in Ti–Nb–Zr–Ta biomedical alloys.
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Autor/in / Beteiligte Person: | Nag, S. ; Banerjee, R. ; Fraser, H. |
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Zeitschrift: | Journal of Materials Science, Jg. 44 (2009-02-01), Heft 3, S. 808-815 |
Veröffentlichung: | 2009 |
Medientyp: | academicJournal |
ISSN: | 0022-2461 (print) |
DOI: | 10.1007/s10853-008-3148-2 |
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