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Effect of Aging on Microstructure and Shape Memory Properties of a Ni-48Ti-25Pd (At. Pct) Alloy

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Abstract

The microstructure and properties of a precipitation-hardenable Ni-48Ti-25Pd (at. pct) shape memory alloy have been investigated as a function of various aging conditions. Both the hardness and martensitic transformation temperatures increased with increasing aging time up to 100 hours at 673 K (400 °C), while no discernable differences were observed after heat treatment at 823 K (550 °C), except for a slight decrease in hardness. For aging at 673 K (400 °C), these effects were attributed to the formation of nano-scale precipitates, while precipitation was absent in the 823 K (550 °C) heat-treated specimens. The precipitation-strengthened alloy exhibited stable pseudoelastic behavior and load-biased-shape memory response with little or no residual strains. The precipitates had a monoclinic base-centered structure, which is the same structure as the P-phase recently reported in Ni(Pt)-rich NiTiPt alloys. 3D atom probe analysis revealed that the precipitates were slightly enriched in Ni and deficient in Pd and Ti as compared with the bulk alloy. The increase in martensitic transformation temperatures and the superior dimensional stability during shape memory and pseudoelastic testing are attributed to the fine precipitate phase and its effect on matrix chemistry, local stress state because of the coherent interface, and the ability to effectively strengthen the alloy against slip.

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Acknowledgements

The authors gratefully acknowledge funding for this research under NASA grant NNX09AO61A and from the NASA FAP Aeronautical Sciences project, Dale Hopkins, API. This study used the Central Analytical Facility, which is supported by The University of Alabama.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL, USA

    Taisuke T. Sasaki (Post Doctorate Fellow, Researcher), B. Chad Hornbuckle (Graduate Student), Mark L. Weaver (Professor) & Gregory B. Thompson (Professor)

  2. National Institute for Materials Science, Tsukuba, Japan

    Taisuke T. Sasaki (Post Doctorate Fellow, Researcher)

  3. Structures and Materials Division, NASA Glenn Research Center, Cleveland, OH, USA

    Ronald D. Noebe (Senior Materials Research Engineer) & Glen S. Bigelow (Materials Engineer)

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  1. Taisuke T. Sasaki
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Correspondence to Gregory B. Thompson.

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Manuscript submitted November 22, 2011.

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Sasaki, T.T., Hornbuckle, B.C., Noebe, R.D. et al. Effect of Aging on Microstructure and Shape Memory Properties of a Ni-48Ti-25Pd (At. Pct) Alloy. Metall Mater Trans A 44, 1388–1400 (2013). https://doi.org/10.1007/s11661-012-1481-1

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