Abstract
This paper presents an experimental characterization of the damping capacity of the Fe-30Mn-6Si-5Cr subjected to cyclic tensile tests. Fe-SMA specimens underwent a specific heat treatment to improve their properties. At room temperature, the studied Fe-SMA showed different microstructures depending on the applied heat treatment. In order to define the best initial properties guaranteeing maximum pseudoelastic damping capacity (PDC), different types of initial microstructures were investigated: purely austenitic state and biphased states (austenite + stress induced and/or thermal martensite). The alloy was studied under different parameters such as loading-unloading frequencies, prestrain amount and operating temperatures. Experimental results were analyzed by computing the energy dissipated from hysteresis loops areas as well as the associated loss factor. Consequently, the beneficial role of the stress-induced martensite () was demonstrated and quantified. Furthermore, it was found that the PDC seems to have slightly improved by the presence of thermal martensite (Mth) and increased with temperature increase. As a result, an economical and efficient initial microstructure for damping application of the studied SMA has been defined.
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