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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Solid State Precipitation
Presentation Title Precipitation Behavior in Ni-Ti-Zr Shape Memory Alloys
Author(s) Suzanne Kornegay, Monica Kapoor, B. Chad Hornbuckle, Othmane Benafan, Ronald Noebe, Mark Weaver,
On-Site Speaker (Planned)
Abstract Scope A series of aging studies on the precipitation in 50.3Ni-(49.7-X)Ti-XZr, where X varied from 1 to 17.5 at. %, have been conducted at 400C and 550C. It was found that two types of precipitates formed in the dilute Zr concentrations and only one type of precipitate at higher concentrations. In the dual precipitate microstructure, the known H-phase precipitate was observed along with a new, spherical precipitate denoted as the S-phase. At higher Zr concentrations, the S-phase was not found. At 1%Zr, after 10 hour/400C, only the S-phase is observed with a composition 55Ni-40Ti-5Zr. At 100 hours, the S- and H-phase are observed with the S-phase being 54Ni-43Ti-3Zr. The depletion of Zr is contributed to a potential competition of this solute with the onset of H-phase precipitation. The compositional evolution of the H-phase at other concentrations and its effect on the shape memory transformation temperature will be discussed.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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