High-entropy alloy with high principal element single-phase close-packed hexagonal structure and preparation method thereof

Abstract

The invention discloses a high-entropy alloy with a high-component single-phase close-packed hexagonal structure, and a preparation method thereof. The high-entropy alloy has nominal compositions being Sc x Y x La x Nd x Gd x Tb x Dy x Ho x Er x Lu x (x is the atomic percent and is equal to 10). Aiming at the physical truth of the development of the high-entropy alloy with the close-packed hexagonal structure in the brand new field of the high-entropy alloy, scandium, yttrium, lanthanum, neodymium, gadolinium, terbium, dysprosium, holmium, erbium and lutecium with the purity being 99.9 percentare adopted as raw materials, are smelted through vacuum arc furnace, and are repetitively smelted for 5 to 6 times under the high-purity argon gas protection atmosphere, so that the homogeneity of afastener alloy ingot obtained through smelting is ensured. According to the high-entropy alloy with the high-component single-phase close-packed hexagonal structure, and the preparation method thereof provided by the invention, the alloy is predicted to be the high-entropy alloy with the close-packed hexagonal structure through the calculation of thermodynamic parameters, the alloy structure is further tested by utilizing an X-ray diffractometer and a transmission electron microscopy, and the alloy is determined to be the high-entropy alloy with the single-phase close-packed hexagonal structure.

Description

technical field [0001] The invention relates to a high-entropy alloy with a single-phase close-packed hexagonal structure with high principal elements and a preparation method thereof, belonging to the technical field of alloy materials. Background technique [0002] With the advancement of human scientific civilization, the requirements for material properties are getting higher and higher, and the traditional alloy design concept based on one or two components can no longer meet the needs of social development. Although traditional materials have outstanding performance in some aspects, it is difficult to meet other requirements, which greatly limits the use of materials. It is precisely because of the desire for new materials that a brand-new alloy design concept came out in 2004: it is composed of five or more main elements in an equimolar ratio or approximately equimolar ratio, and each element accounts for 5% of the total composition. %-35%, and finally form a simple ...

AI Technical Summary

Problems solved by technology

Zhang Yong et al. (Y. Zhang, T.T. Zuo, Z. Tang, M.C. Gao, K.A. Dahmen, P.K. Liaw, and Z.P. Lu, Microstructures and properties of high-entropy alloys, Prog. Mat. Sci. 2014, vol. 61, pp . 1–93.) and M.C. Gao, B. Zhang, S.M. Guo, J.W. Qiao, J.A.Hawk, High-entropy alloys in hexagonal close-packed structure, Metall. Mater.Trans. A. 2016, vol. 47 , pp. 3322–3332.) have made predictions on the thermodynamic parameters of high-entropy alloys with hexagonal close-packed structures, but there is still little research on high-entropy alloys with hexagonal close-packed structures. From the preparation of the alloys to their properties tests are still in the initial development stage

High-entropy alloys are also known as multi-element alloys. At present, the research on high-entropy alloys mainly focuses on 5-8 components, and no further research has been carried out on alloy structures with higher principal elements.

Images