NxMy high-entropy alloy with shape memory effect and preparing method thereof

Abstract

The invention relates to NxMy high-entropy alloy with a shape memory effect and a preparing method thereof. The alloy comprises NxMy, wherein x is larger than or equal to 45 and smaller than or equal to 55, y is larger than or equal to 45 and smaller than or equal to 55, the N is any two or more of Ti, Zr, Hf, V, Nb, Ta, Mo and W and the M is any two or more of V, Mn, Fe, Co, Ni, Cu, Cr and Zn; and the content of the Ti, the content of the Zr, the content of the Hf, the content of the V, the content of the Nb, the content of the Ta and the content of the Mo in the N are each larger than or equal to 5% and smaller than or equal to 35%, and the content of the V, the content of the Mn, the content of the Fe, the content of the Co, the content of the Ni, the content of the Cu, the content of the Cr and the content of the Zn are each larger than or equal to 5% and smaller than or equal to 35%. A body-centered cubic single-phase solid solution with the volume fraction not lower than 95% and an intermetallic compound form the alloy phase structure. The alloy is prepared through an electric arc melting method. The alloy has the shape memory effect within a wider temperature range and meanwhile has the high-entropy alloy feature. The NxMy high-entropy alloy and the preparing method have wide application prospects in the fields of aerospace, mechanical electronic products and low-temperature industries.

Description

technical field [0001] The invention belongs to the field of high-entropy alloys and shape memory alloy materials, in particular to a N x m y High-entropy alloys and methods for their preparation. Background technique [0002] The shape memory principle of metals and high-entropy alloys is that the crystal structure has a law that can change with temperature, and is affected by the composition, structure and phase transition of the material. The shape memory property is expressed by the deformation recovery coefficient. In 1963, Biller of the U.S. Naval Ordnance Research Institute discovered in his research work that in a certain temperature range higher than room temperature, a nickel-titanium alloy wire was fired into a spring, and then straightened or stretched in cold water. Cast into square, triangle and other shapes, and then placed in hot water above 40 ℃, the alloy wire will return to the original spring shape. It was later discovered that certain other alloys ha...

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Problems solved by technology

[0004] 1) Since high-entropy alloys are new metal materials, high-entropy shape memory alloys have not been invented in the high-entropy alloy series;

[0005] 2) Since the phase transition temperature of a single phase of shape memory alloy is relatively stable, it is difficult to adjust the phase transition temperature;

[0007] Due to the above reasons, the use of existing shape memory alloys is difficult to meet the industrial application requirements at low temperatures, hindering the further development of low temperature industry; in addition, high-entropy alloys have invented shape memory alloys, which can effectively adjust the phase transition by using the characteristics of high-entropy alloys The temperature point also facilitates the phase transition to occur more easily

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