Large mechanical damping behaviors in a Heusler-type Co53V30.5Ga12Mn4.5 polycrystalline alloy

Abstract

Shape memory alloys exhibit strong damping capacity owing to the formation and motion of internal interfaces during the hysteretic superelastic response. Here, we report large mechanical damping behaviors in a Co53V30.5Ga12Mn4.5 polycrystalline alloy. By using Mn substitution for V to strengthen the ferromagnetic coupling in association with the martensitic transformation, the thermal hysteresis in the Co53V30.5Ga12Mn4.5 alloy is enhanced to 31.1 K. Under a low compressive loading of 248 MPa, a large dissipated energy of 2.45 MJ m–3 and a high specific damping capacity (SDC) of 0.39 can be achieved. Moreover, a long-term cyclability of over 10,000 superelastic cycles with the SDC higher than 0.32 is also obtained. Developing high-performance damping materials with the integration of low driving stress, high damping capacity and long fatigue life is of great importance for damping applications.