The Physical and Mechanical Properties of a Shape Memory Alloy Reinforced with Carbon Nanotubes (CNTs)
The shape Memory Alloy (SMA) (Copper-Aluminum-Nickel) was prepared in the research by Powder metallurgy (PM) in component percentage (Cu-13% Al-4% Ni), pressure of (500 Mpa) in one direction, and sintering in (800°C) with Nitrogen gas for three hours. (CNTs) was added in percentage (0,0.5,1.0,1.5,2.0,2.5) % as a volumetric ratio at the relatively of the copper ratio to obtain advanced composites for Carbon Nanotubes with a distinct effect on properties.
The elements of the alloy were analyzed using the (EDS) system attached to the Scanning Electron Microscopy (SEM) and study the X-ray Diffraction (XRD) to definition the elements and compounds formed after the process of sintering while imaging the microscopic structure by both Optical Microscopes and (SEM).
The physical characteristics were studied as the results showed that by increasing the content of the Carbon Nanotubes (CNTs), The Bulk Density values of the (Cu-13% Al-4% Ni) decrease by ratio (23.5%) for content of Carbon Nanotubes (0%) to (2.0%) associated with an increase in True Porosity with the increase of the (CNTs) content at the same ratio (27.85%) and the impact is reversed when the content is increased to (2.5%) as it corresponds to the Water Absorption. The decrease in thermal conductivity corresponds to the increase in the True porosity ratio while slightly improving the amount Thermal Conductivity at an add (2.5%) percentage (2.0%) of the (CNTs). Some Mechanical properties, such as Hardness and Compressive Strength, have been reduced by increasing the content of the (CNTs) to (2%) While there has been a slight improvement in these two characteristics at the corresponding ratio.