High temperature damping behavior and phase transition characteristics of high-entropy MnCuNiFeZn damping alloy

A new MnCuNiFeZn high entropy damping alloy was prepared. The microstructure , damping properties and phase transition characteristics of the alloy were studied by X-ray diffractometer , scanning electron microscopy , transmission electron microscopy , dynamic thermomechanical analyzer (DMA ) and thermal dilatometer. The results show that the MnCuNiFeZn alloy is a single parent phase with uniform grain size and high fault density under solid solution and different aging processes. It is found that the magnetic transformation of the alloy occurs at room temperature with the extension of aging time , but the internal friction value at room temperature is very low. However , the internal friction value of MnCuNiFeZn alloy increases sharply in the high -temperature domain above 673 K due to the phase transformation.