Hyperelastic TiZrHfNbAl high-entropy alloy and manufacturing methods thereof

Abstract

The invention relates to a hyperelastic TiZrHfNbAl high-entropy alloy and manufacturing methods thereof, and belongs to the field of high-entropy alloy materials. The alloy ingredient expression is TiaZrbHfcNbdAle. The two manufacturing methods are included, according to one manufacturing method, a mechanical and chemical combined method is used for removing surface scale of raw material metal, and the raw material metal is washed through industrial alcohol ultrasonic vibration; a vacuum arc furnace is used for melting the alloy, and when the vacuum degree reaches 5*10<-2> Pa, industrial argon is inflated; and after a mother alloy is sufficiently melted evenly, a vacuum casting or suction-casting device is used, the alloy is injected into a water cooling copper die, a high-entropy alloy bar is obtained, cold rolling is carried out at the room temperature until the thickness is 30% to 80% of the original thickness, a surface layer is removed, washing through industrial alcohol ultrasonic vibration is carried out, and then the product is sealed into a quartz tube full of argon for heat treatment. According to the other manufacturing method, preparation according to the weight percentage is carried out, pressing is carried out after even mixing is achieved, an electrode is obtained, then vacuum melting is carried out in a vacuum consumable electrode electric arc furnace, an alloy bar is obtained through casting in a vacuum consumable electrode skull furnace, alloy remelting and casting are carried out, and the processes are repeatedly executed two to three times.

Description

technical field [0001] The invention relates to the field of metal materials and their preparation, and provides a superelastic high-entropy alloy whose composition is TiZrHfNbAl and a preparation method thereof. Background technique [0002] The shape memory effect and superelasticity are the peculiar properties of some alloys that exhibit stress-induced martensitic transformation. The alloy deforms at low temperature, and when heated to a critical temperature, it restores its original state through reverse phase transformation, which is called the shape memory effect. . Without the need for heating, it returns to its original state after unloading, which is called superelasticity. At present, the research on the transformation-induced plasticity of high-entropy alloys mainly focuses on strengthening and toughening through phase transformation. There is no report on the research on superelasticity or shape memory of high-entropy alloys with stress-induced martensitic trans...

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Problems solved by technology

Among them, the most widely studied FeCoCrNiMn high-entropy alloy has a tensile plasticity of up to 60%, but its strength is only 200-500 MPa, while other high-entropy alloys with body-centered cubic structures and high-melting-point high-entropy alloys have no reports on tensile properties.

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