Effects of torsional oscillation on tensile behavior of Sn-3.5Â wt% Ag alloy with and without adding ZnO nanoparticles

Stress-strain characteristics of both Sn-3.5 wt% Ag and Sn-3.5 wt% Ag-0.3 wt% ZnO alloys were investigated using tensile testing machine. Different superimposed torsional oscillation frequencies ranging from 0 to 1.3 Hz at different deformation temperatures ranging from 303 to 363 K were performed. X-ray diffraction (XRD), transition electron microscopy (TEM) and optical microscopy were used to investigate the microstructures of both alloys. The mechanical parameters such as Young׳s modulus Y, yield stress σy, fracture stress σf, work hardening coefficient χp and fracture strain εf were calculated. The fracture stress of both alloys decreases with increasing the superimposed frequency of torsional oscillations as well as deformation temperatures. The fracture strain behaves in a different manner i.e. it increases with increasing the deformation temperature in the alloy containing ZnO nanoparticles while decreases in the alloy free from ZnO nanoparticles. With respect to the effect of the frequency of the superimposed torsional deformation, the fracture strain increases in both alloys.