Abstract
A smart composite material constituted of a magnetic hybrid film and a NiTi shape memory alloy (SMA) ribbon was obtained and characterized. The magnetic hybrid film was joined to the NiTi ribbon in order to combine the properties of both materials. This new composite material combines magnetic properties of the hybrid film, (Fe2O3-CMC)/(polyvinyl butyral), and the shape memory properties of the NiTi ribbon, which has a chemical composition of Ti-50.13 at. % Ni. This smart composite material has a mass of 18.3% NiTi ribbon and 81.7% magnetic hybrid film. Results obtained by DSC show that the smart composite material presents a small delay of transformation during warming and cooling because the magnetic hybrid film acts like a thermal insulator. Thermomechanical results indicate that the hybrid material also acts as a mechanical reinforcement, since it is observed that the Stress-Assisted Two-Way Memory Effect (SATWME) of the smart composite is lower than the SATWME of the SMA ribbon. The density current values of phase transformations were clearly identified with a thermomechanical apparatus developed in our laboratory. Finally, displacements of the smart composite material in cantilever configuration are obtained by applying an external magnetic field. All these results demonstrate that the smart composite material can be activated by temperature, electrical current, stress, and/or magnetic field, offering good expectations for actuating applications with multiphysic transduction.
Highlights
Composite materials should acquire properties of those materials forming the new material
Differential scanning calorimetry (DSC) results show that transformation temperatures of the NiTi ribbon and the glass transition temperature of the magnetic hybrid material are nearby
The smart composite material presents a small delay of transformation during warming and cooling because the hybrid film acts like a thermal insulator
Summary
Composite materials should acquire properties of those materials forming the new material. Composites based on shape memory alloys (SMAs) are regarded as promising candidates for the so-called “smart composite materials” [1]. In this sense, shape memory composites, with either embedded or bonded shape memory material systems, provide tremendous potential for creating new paradigms in material-structural interactions [2,3,4,5]. The objective of this article is to present the first results of a smart composite material with multiphysic transduction that can be activated by several stimuli such as electrical current, temperature, stress, and magnetic field.
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