High-entropy alloy CoCrCuFeNi laser recasting layer and preparation method thereof

Abstract

The invention discloses a preparation method of a high-entropy alloy CoCrCuFeNi laser recasting layer. The preparation method comprises the following steps that 1, a high-entropy alloy CoCrCuFeNi rawmaterial is prepared, and the raw material is put into a water-cooled copper crucible; 2, the vacuum degree is vacuumized to 5*10 Pa, an air suction system is closed, argon is injected, the air inflation system is closed; 3, arc striking is started, so that the metal raw material is completely molten; 4, after different metal elements are uniformly fused, so that the metal elements naturally coolthe metal raw material in a circulating water cooling copper mold, and a round cake-shaped ingot is finally obtained; 5, the smelted high-entropy alloy CoCrCuFeNi round cake-shaped ingot is cut into asheet through a wire cutting method; and 6, a continuous multi-channel laser remelting method is adopted to weld the surface of the high-entropy alloy CoCrCuFeNi: the yield stress of the high-entropyalloy CoCrCuFeNi laser remelting layer is calculated, wherein the yield stress of the laser remelting layer is larger than that of a base material, the yield stress of the base material is 125.94 + / -23.56 MPa, the laser power is 500 W, the welding speed is 1.4m / min, and the yield stress of the laser remelting layer obtained under welding parameters is the maximum and reaches 306.06 + / -31.49 MPa.

Description

technical field [0001] The invention relates to a high-entropy alloy laser recasting layer, in particular to a high-entropy alloy CoCrCuFeNi laser recasting layer and a preparation method thereof. Background technique [0002] High-entropy alloys are different from traditional alloys in that they are the result of the interaction of multiple principal elements, rather than a single element that reflects the unique properties of a certain element. In high entropy alloys, due to the intermixing of multiple principal elements, the following effects will occur: high entropy effect, lattice distortion, slow diffusion and cocktail effect. These factors enable high-entropy alloys to have a variety of properties, and thus have a wide range of uses. High-entropy alloys have excellent properties that cannot be compared with traditional alloys, such as higher strength and hardness, good plasticity, toughness, and durability. Fire softening and high temperature stability, excellent cor...

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Problems solved by technology

[0003] However, high-entropy alloys have disadvantages such as low thermal conductivity and poor welding performance.

At present, the main problems in the welding of high-entropy alloys are: as the strength of the weld decreases, the chemical composition is easy to segregate, and after the welding thermal cycle, complex microstructure and element distribution appear in the fusion zone of the welded joint

When pulsed laser welding high-entropy alloys, the energy of the laser beam is discontinuous, and cracks are prone to occur in the weld

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