Twinning damping interface design and synergistic internal friction behavior in FeMnCrCo high-entropy alloys

Vibration and noise reduction has always been important problem to be solved in the fields of rail transit, aerospace, marine engineering, and so on. In this paper, a novel Fe65-XMn20Cr15CoX (X = 5, 10, 15, 20) dual -phase high-entropy damping alloy with excellent properties were prepared by vacuum melting. The depen-dence of the alloy damping behavior on the twin interface, magnetic properties and phase interface was emphatically analysed. The effects of Co content on its microstructure, damping behavior and magnetic prop-erties were investigated. The results show that with the increase of Co content, epsilon martensite gradually transforms to gamma austenite, and the number of twins increases gradually. The peak damping (Q-1) increased from 0.0442 to 0.0595, an increase of 34.6%. The coupled effects of magneto-mechanical hysteresis, twin interface motion, and phase interface motion provide the alloy's excellent damping properties. The alloy has a higher damping internal friction peak of around 200 degrees C, which is due to the phase transition from epsilon to gamma at the temperature. By adjusting the Co content, the phase content and twinning and other microstructures of the alloy can be regulated, and multiple damping mechanisms can be coupled to achieve higher damping performance.

Automated summary

This paper investigates the preparation and properties of a novel high-entropy damping alloy. The experimental results show that the alloy exhibits excellent damping performance, which is related to the twin interface, magnetic properties, and phase interface. By adjusting the composition of the alloy, multiple damping mechanisms can be coupled to further enhance the damping performance.