High performance damping behavior of Ni-Fe-Ga alloys within the martensite/strain-glass phase boundary

Strain glass alloys are promising candidates of high performance damping materials for their broad damping peaks. To realize the practical applications, the large damping capacity and broad ambient temperature range are highly desirable. However, the high damping behavior covering ambient temperature has not yet been achieved in strain glass systems, and how to obtain a maximum damping capacity in the same strain glass system remains unclear. Here, we reported the broad ambient temperature damping of Ni_73−xFe_xGa₂₇ (x = 23.5–24.5) strain glass alloys. The damping capacity of Ni_73−xFe_xGa₂₇ strain glass alloys increases as the compositions move towards the martensite/strain-glass phase boundary, and the maximum damping value (~0.12) is achieved in Ni_49.5Fe_23.5Ga₂₇ strain glass alloy within the phase boundary. The boundaries of martensitic nano-domain are very mobile in phase boundary region, which leads to broad and high damping peak around ambient temperature. Our results provide an effective way to design high performance damping materials.