On spinodal characteristics in Mn-Cu-Ni-Fe-Sn alloys containing 0∼0.6 wt.%Ti

The damping mechanism of Mn-Cu based alloys is usually ascribed to the antiferromagnetic transition and subsequent FCC-FCT martensitic transformation which take place in spinodal Mn-rich regions. In the present work, we investigate the influence of Ti substitution on the spinodal characteristics in the Mn-Cu based alloys subjected to ageing treatments. The experiments of X-ray diffraction (XRD), internal friction (IF) examination, transmission electron microscope (TEM) and mechanical spectrum characterizations were performed. The results highlight that the appearance of the Cu clusters enhances the Mn content in neighboring regions. Moreover, the Ti addition can promote the element diffusion, thus the damping capacity of the 0.2Ti alloy is the highest in the Mn-Cu based alloys.