A kind of high-temperature high-damping high-entropy alloy and its preparation method

Abstract

The invention relates to a high-temperature, high-damping high-entropy alloy and a preparation method thereof, which is achieved by micro-alloying oxygen or nitrogen elements in a refractory high-entropy alloy matrix and utilizing the high thermal stability of the high-entropy alloy matrix, thereby realizing such a high-entropy alloy. High temperature damping properties of entropy alloys. The process is as follows: Metal raw materials such as Ta, Nb, Hf, Zr, Ti, Mo, V, W, Al, etc. are mechanically removed from scale and then weighed according to molar ratio, and other added elements are mechanically peeled, ultrasonically cleaned or pickled. After weighing according to molar ratio, oxygen element is added in the form of oxide, and nitrogen element is added in the form of nitride; the alloy is obtained by melting in a non-consumable vacuum electric arc furnace or cold crucible suspension furnace, and using vacuum suction casting or casting equipment. The invention utilizes the high structural stability of the high-entropy alloy, and significantly improves the high-temperature damping performance and mechanical performance of the alloy through microalloying of small atoms.

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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