High temperature and high damping high entropy alloy and preparation method thereof

Abstract

The invention relates to a high temperature and high damping high entropy alloy and a preparation method thereof. Due to the microalloying oxygen or nitrogen elements of a refractory high-entropy alloy matrix and utilizing high thermal stability of a high-entropy alloy matrix, the high temperature and damping capacity of the high entropy alloy is achieved. The process is as follows: the metal materials Ta, Nb, Hf, Zr, Ti, Mo, V, W, Al, etc. are subjected to mechanical removal of oxidized scale, and are weighted by the molar ratio; other added elements are mechanically scaled, ultrasonically cleaned or pickled, and weighted by the molar ratio; the oxygen element is added in the form of an oxide, and the nitrogen element is added in the form of a nitride; and the alloy is obtained by vacuumcasting or casting equipment through smelting in a non-consumable vacuum electric arc furnace or a cold crucible suspension furnace. The high temperature and high damping high entropy alloy and the preparation method thereof utilize the high structural stability of the high-entropy alloy, and significantly improves the high temperature damping performance and mechanical property of the alloy by small atom microalloying.

Description

technical field [0001] The invention belongs to the field of metal materials and their preparation, in particular to a high-temperature, high-damping, high-entropy alloy and a preparation method thereof. Background technique [0002] The development of science and technology has greatly improved the power and operating speed of mechanical equipment, but it has also inevitably brought mechanical vibration and noise pollution. Vibration and noise not only greatly reduce the service life of equipment, but also seriously affect the ecological environment and damage the physical and mental health of the public. Therefore, in recent years, high-damping alloys used to reduce vibration and noise and improve the working environment of man-machines have received more and more attention from scientific researchers. [0003] The development of high-damping alloys, according to their different damping mechanisms, has roughly formed three types of traditional high-damping alloys: disloca...

AI Technical Summary

Problems solved by technology

However, the mechanical properties of these three types of high damping alloys need to be improved, and their service stability is insufficient, and the service temperature is low.

The low-dimensional defects in the three types of high-damping alloys are prone to diffusive redistribution under continuous vibration loads, and are gradually enriched in the high-dimensional defect region, resulting in pinning, which eventually leads to a gradual decrease in the relaxation strength of the high-dimensional defect until disappear, which greatly deteriorates the damping performance of the alloy and shortens its service life

[0005] Although Snoek-type high-damping alloys make up for the poor stability of traditional alloys, these alloys do not improve their high-temperature damping performance and mechanical properties.

Similar to traditional high-damping alloys, this type of high-damping alloy is still only suitable for low temperature regions of 300-500°C

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