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Fabrication of Mechanically Tunable and Bioactive Metal Scaffolds for Biomedical Applications
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Compositionally graded Ti-Ni alloys prepared by diffusion bonding.

Jin-Hwan Lim, Min-Soo Kim, Jung-Pil Noh

    Journal of Nanoscience and Nanotechnology
    |May 15, 2015
    PubMed
    Summary

    This study developed a compositionally graded titanium-nickel (Ti-Ni) alloy for actuators. The novel alloy exhibits a wide transformation temperature window and significant recoverable elongation for precise control.

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    Area of Science:

    • Materials Science
    • Metallurgy
    • Shape Memory Alloys

    Background:

    • Titanium-nickel (Ti-Ni) alloys are crucial for actuators due to their shape memory effect.
    • Achieving precise position control requires actuators with a wide operating temperature range.

    Purpose of the Study:

    • To prepare a compositionally graded Ti-Ni alloy for enhanced actuator performance.
    • To investigate the microstructure and martensitic transformation behavior of the graded alloy.

    Main Methods:

    • Spark Plasma Sintering (SPS) of stacked Ti-Ni alloy ribbons with varying compositions (Ti-51Ni to Ti-48Ni).
    • Post-SPS annealing to eliminate inter-ribbon defects.
    • Microstructural analysis using Field Emission Scanning Electron Microscopy (FE-SEM).
    • Differential Scanning Calorimetry (DSC) and thermal cycling tests under constant load to study transformation behavior.

    Main Results:

    • Successful preparation of a compositionally graded Ti-Ni alloy with a 1.5 at% Ti variation along the thickness.
    • Elimination of inter-ribbon defects through post-SPS annealing at 1023 K.
    • A wide martensitic transformation temperature window of 91 K on cooling and 79 K on heating.
    • Achieved 0.9% recoverable elongation under 80 MPa with a deformation rate of 0.015%/K.

    Conclusions:

    • The compositionally graded Ti-Ni alloy offers a broad transformation temperature range, beneficial for precise actuator control.
    • The developed material demonstrates significant recoverable strain, suitable for advanced actuator applications.