High-nickel eutectic high-entropy alloy powder for additive manufacturing and preparation method of high-nickel eutectic high-entropy alloy powder

Abstract

The invention relates to a high-nickel eutectic high-entropy alloy powder for additive manufacturing and a preparation method of the high-nickel eutectic high-entropy alloy powder. The high-nickel eutectic high-entropy alloy powder mainly comprises aluminum, iron, chromium, cobalt, nickel, silicon and boron elements, wherein the mole ratio of aluminum atoms is 0.5-1.5, the mole ratio of iron atomsis 1.0-1.5, the mole ratio of chromium atoms is 0.8-1.5, the mole ratio of cobalt atoms is 0.5-1.0, the mole ratio of nickel atoms is 1.0-2.5, the mole ratio of silicon atoms is 0-0.05, and the moleratio of boron atoms is 0-0.05. The preparation method of the powder includes the following steps that 1, a high-entropy master alloy is prepared by using a vacuum induction smelting furnace; and 2, the high-entropy alloy powder is prepared by using a crucible-free induction melting atomization furnace. The high-entropy alloy powder prepared by the preparation method is spherical or nearly spherical to form a eutectic structure, so that burning loss of low-melting-point elements and component segregation of the multi-element alloy are reduced, and rapid and precise manufacture and remanufacturing repair of high-temperature-resistant special parts can be effectively achieved. The high-nickel eutectic high-entropy alloy powder avoids the problems of low strength or poor plasticity of a traditional single-phase high-entropy alloy material.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a high-nickel eutectic high-entropy alloy powder for additive manufacturing and a preparation method thereof. Background technique [0002] Traditional high-entropy alloys are prone to form simple face-centered cubic, simple body-centered cubic or hexagonal close-packed structures. Generally speaking, face-centered cubic structure HEA has good thermodynamic stability, super ductility and remarkable work hardening performance, but low strength; body-centered cubic or close-packed hexagonal structure HEA has high strength, But the ductility is poor. Eutectic high-entropy alloys have attracted extensive attention due to their high strength and ductility, which are suitable for various engineering applications. [0003] Additive manufacturing belongs to the rapid quenching forming process. On the one hand, it can avoid the shortcomings existing in the preparation of as-cast high-en...

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Problems solved by technology

[0004] In order to solve the problems of traditional high-entropy alloys or low-temperature strength or low plasticity and powder preparation

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