Preparation method of nbzrtita refractory high-entropy alloy powder and nbzrtita refractory high-entropy alloy powder

Abstract

The invention discloses an NbZrTiTa refractory high-entropy alloy powder preparation method and NbZrTiTa refractory high-entropy alloy powder. The NbZrTiTa refractory high-entropy alloy powder preparation method comprises the following steps of mixing raw materials, namely, Nb, Zr, Ti and Ta elementary powder; then adding absolute ethyl alcohol and / or normal heptane; and carrying out high energy ball milling to obtain the NbZrTiTa refractory high-entropy alloy powder with a single-phase BCC structure. The preparation method provided by the invention is simple in steps, can be quantitively andrepetitively operated, and high in powder yield; and the prepared NbZrTiTa refractory high-entropy alloy powder is uniform in structure and element distribution, fine in grain size, and is of the single-phase body-centered cubic (BCC) structure.

Description

technical field [0001] The invention relates to the field of high-entropy alloys, in particular to a preparation method of NbZrTiTa refractory high-entropy alloy powder and the NbZrTiTa refractory high-entropy alloy powder. Background technique [0002] High entropy alloy is a new type of alloy developed in recent years. Different from traditional alloys with one or two elements as the main components, high-entropy alloys refer to alloys formed by more than four components with equal or similar molecular weights, in which the content of each element is much greater than 5% and not higher than 30%, the alloy has a single-phase solid solution structure in which the main components are randomly mixed, and this structure has a high mixing entropy, so it tends to form a single-phase or multi-phase high-entropy solid solution with a simple structure instead of intermetallic compounds, etc. complex structure. This new type of alloy has high mixing entropy effect in thermodynamics...

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Problems solved by technology

However, there are a series of difficulties in the preparation process of high-melting-point NbZrTiTa high-entropy alloys: due to the high melting point of the alloy, the traditional melting and casting method must overcome the problem of high heating temperature, and the process is difficult; in order to make the composition uniform, it needs to undergo At the same time, inhomogeneity such as dendrite segregation will inevitably occur during the solidification of the melt. Although the NbZrTiTa high-entropy alloy prepared by the vacuum arc melting method exhibits excellent mechanical properties and There are huge application potentials in the field of structural materials, but there are also a series of insurmountable shortcomings: the limit size of the homogeneous sample of the smelted product is only about 40mm and there are shrinkage cavities that cannot be eliminated

However, since the constituent elements of NbZrTiTa are refractory metals with high melting points, these metals have the characteristics of high hardness, poor plasticity, and low diffusion coefficient, so the above method cannot be used for the preparation of NbZrTiTa bulk alloys

[0006] At present, the literature on high-melting-point high-entropy alloys is very limited, and the preparation method of high-melting-point high-entropy alloy NbZrTiTa is also limited to the vacuum arc melting method.

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