Composites Containing Nanostructured Shape-Memory Alloys

Overview

The document is a final performance report on research conducted on nanostructured shape memory alloys (SMAs) and their application in adaptive composite materials and components. Authored by Wendy C. Crone, Arthur B. Ellis, and John H. Perepezko from the University of Wisconsin-Madison, the report was prepared for the Air Force Office of Scientific Research (AFOSR) and covers the project period from April 1, 2004, to September 30, 2007.

The research focuses on the fabrication methods for creating composite materials that incorporate shape memory alloy constituents. Various techniques were explored, including mechanical rolling methods, to produce SMA-polymer and SMA-metal composites. A significant aspect of the study was the development of new fabrication strategies aimed at producing NiTi (Nickel-Titanium) and CuAlNi (Copper-Aluminum-Nickel) shape memory alloy particles with refined sizes, which retain their shape memory and pseudoelastic properties.

The report highlights the promising fracture toughness behavior of the composite materials developed during the research. A key innovation discussed is a functionalization strategy that enhances adhesion between the shape memory alloy constituents and the polymeric matrix, allowing for tunable control over the interface properties. This advancement is crucial for improving the performance and reliability of the composite materials in practical applications.

Additionally, the research delves into the manipulation and control of individual liberated nanowires using nickel end caps and magnetic fields. This technique has enabled precise sample positioning for characterization and has facilitated optical switching behavior, showcasing the versatility and potential of these materials in advanced technological applications.

The report also notes that the research has inspired several educational projects, indicating a broader impact on public science education. Overall, the findings contribute to the understanding and development of adaptive composite materials, with implications for various fields, including aerospace and materials science.

In summary, this document encapsulates significant advancements in the fabrication and application of nanostructured shape memory alloys, emphasizing their potential in creating innovative composite materials with enhanced properties and functionalities.