Following their discovery in the early 1960s, there has been a continuous quest for ways to take advantage of the extraordinary properties of shape memory alloys (SMAs). These intermetallic alloys can be extremely compliant while retaining the strength of metals and can convert thermal energy to mechanical work. The unique properties of SMAs result from a reversible diffussionless solid-to-solid phase transformation from austenite to martensite. The integration of SMAs into composite structures has resulted in many benefits, which include actuation, vibration control, damping, sensing, and self-healing. However, despite substantial research in this area, a comparable adoption of SMA composites by industry has not yet been realized. This discrepancy between academic research and commercial interest is largely associated with the material complexity that includes strong thermomechanical coupling, large inelastic deformations, and variable thermoelastic properties. Nonetheless, as SMAs are becoming increasingly accepted in engineering applications, a similar trend for SMA composites is expected in aerospace, automotive, and energy conversion and storage-related applications. In an effort to aid in this endeavor, a comprehensive overview of advances with regard to SMA composites and devices utilizing them is pursued in this paper. Emphasis is placed on identifying the characteristic responses and properties of these material systems as well as on comparing the various modeling methodologies for describing their response. Furthermore, the paper concludes with a discussion of future research efforts that may have the greatest impact on promoting the development of SMA composites and their implementation in multifunctional structures.

/pdf/review-and-perspectives-shape-memory-alloy-composite-systems-2a0ee34o1x.pdf

Review and perspectives: shape memory alloy composite systems

The magnetostrictive materials exhibit a strain caused by the orientation of the magnetic moment when exposed to a magnetic field. A particular class of magnetostrictive materials is called magnetic shape memory (MSM) alloys or ferromagnetic shape memory alloy (FSMA) materials, which can change their shape remarkably when subjected to magnetic field. In the following, the MSM materials are introduced and their extraordinary structure, properties, and performance are described.

Giant Magnetostrictive Materials

Textured polymer bonded composites with Ni-Mn-Ga magnetic shape memory particles

The ferromagnetic shape-memory effect in Ni–Mn–Ga

Ni–Mn–Ga/polymer composites are an interesting group of materials with new potential for applications such as vibration damping. Polymer selection is critical for Ni–Mn–Ga/polymer composites. The transition temperatures of both components should be selected carefully considering the future application, the contact between Ni–Mn–Ga and polymer is important and stiffness of the polymer matrix is one of the influencing factors. The adhesion between Ni–Mn–Ga and the polymer matrix was studied in shear stress tests. Ni–Mn–Ga adhered strongly to the tested epoxies but considerably less so to silicones. The damping properties of Ni–Mn–Ga/polymer composites were studied by dynamic mechanical analysis (DMA). Compared to the pure polymer sample, DMA measurements confirmed extra damping in the martensite–austenite transition temperature region of the Ni–Mn–Ga after a soft epoxy matrix had been applied.

/pdf/dma-testing-of-ni-mn-ga-polymer-composites-565hlnm4r2.pdf

DMA testing of Ni-Mn-Ga/polymer composites

Microstructures and properties of spinel-periclase-calcium aluminate refractories

In Situ Synthesis of Mapbx3 Perovskite Quantum Dot-Polycaprolactone Composites for Fluorescent 3d Printing Filament

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Microstructures and properties of spinel-periclase-calcium aluminate refractories

In Situ Synthesis of Mapbx3 Perovskite Quantum Dot-Polycaprolactone Composites for Fluorescent 3d Printing Filament