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Production of Ti-22Nb-6Zr Shape Memory Alloy by Powder Metallurgy
Technical Paper
2012-36-0467
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Shape Memory Alloys (SMA) are novel materials which have the ability to return to a predetermined shape when heated. SMA are useful as actuators which are materials that change shape, stiffness, position, natural frequency, and other mechanical characteristics in response to temperature or electromagnetic fields. Applications include engines in cars and airplanes, electrical generators and surgical implants that make use of the mechanical energy resulting from the shape transformations. Powder metallurgy allows the SMA production with savings of energy and time and with higher microstructural homogeneity than those obtained by conventional processes. In this work a new nickel-free titanium alloy Ti-22Nb-6Zr (%at) was produced in order to expand the application field of SMA. Samples were produced by mixing of initial metallic powders followed by uniaxial and cold isostatic pressing with subsequent densification by sintering between 800-1600°C, in vacuum. Sintered samples were characterized for phase composition, microstructure and microhardness by X-ray diffraction, scanning electron microscopy and Vickers indentation, respectively. Density was measured by Archimedes method. It was shown that the samples were sintered to high densities and presented homogeneous microstructure with complete dissolution of alloying elements in the titanium matrix.
Authors
- Thais dos Reis Luz - Escola de Engenharia de Lorena EEL - USP
- Eliene Nogueira de Camargo - Instituto Tecnologico de Aeronautica - ITA
- Vinicius Andre Rodrigues Henriques - Instituto de Aeronautica e Espaco IAE/DCTA
- Jose Luis de Oliveira - Instituto de Aeronautica e Espaco IAE/DCTA
- Edevaldo Faria Diniz - Instituto de Aeronautica e Espaco IAE/DCTA
Topic
Citation
dos Reis Luz, T., de Camargo, E., Henriques, V., de Oliveira, J. et al., "Production of Ti-22Nb-6Zr Shape Memory Alloy by Powder Metallurgy," SAE Technical Paper 2012-36-0467, 2012, https://doi.org/10.4271/2012-36-0467.Also In
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