Study of the Evolution of the Structure of a High-Entropy Al20Ni20Co20Fe20Cr20 Alloy under the Action of High Pressure and Temperature

IF 0.5 Q4 PHYSICS, CONDENSED MATTER

Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2024-09-26 DOI:10.1134/S1027451024700551

S. G. Menshikova

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Abstract

The structure of a high-entropy submicrocrystalline AlNiCoFeCr alloy of equiatomic composition obtained by arc melting is studied by electron microscopy and X-ray diffraction. The alloy consists of a substitutional solid solution with the packing of components corresponding to the B2 structure based on a distorted BCC lattice. The average grain size of the B2 phase is 120 nm. The stability of the alloy with increasing temperature is studied. When the alloy is heated to 1650°C and subsequently solidified an increase in the grain size of the B2 phase and the separation of several phases with different morphologies along the grain boundaries are observed in the structure. The effect of high pressure on the alloy structure after quenching from the liquid phase is explored. The structure of the sample obtained upon solidification at a temperature of 1650°C under a pressure of 5 GPa is different from the structure of the alloy obtained at a temperature of 1650°C by arc melting. Under thermobaric conditions, a structure of mixed A1 (body-centered cubic) and A2 (face-centered cubic) phases is formed in the alloy. The alloy has high hardness, the value of which, depending on the selected production conditions, varies from 4.8 to 5.5 GPa.

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高熵 Al20Ni20Co20Fe20Cr20 合金在高压和高温作用下的结构演变研究

通过电子显微镜和 X 射线衍射研究了电弧熔化获得的等原子成分的高熵亚微晶铝镍钴铁铬合金的结构。该合金由一种置换固溶体组成，其成分堆积与基于扭曲 BCC 晶格的 B2 结构相对应。B2 相的平均晶粒大小为 120 纳米。研究了合金在温度升高时的稳定性。当合金被加热到 1650°C 并随后凝固时，可以观察到 B2 相的晶粒尺寸增大，并且在结构中沿着晶界分离出具有不同形态的几种相。研究还探讨了液相淬火后高压对合金结构的影响。在 5 GPa 的压力下，样品在 1650°C 的温度下凝固后得到的结构与在 1650°C 的温度下通过电弧熔化得到的合金结构不同。在热压条件下，合金中形成了 A1（体心立方）和 A2（面心立方）混合相结构。该合金具有很高的硬度，其硬度值在 4.8 至 5.5 GPa 之间，具体取决于所选择的生产条件。

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来源期刊

Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques PHYSICS, CONDENSED MATTER-

CiteScore

0.90

自引率

25.00%

发文量

144

审稿时长

3-8 weeks

期刊介绍： Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques publishes original articles on the topical problems of solid-state physics, materials science, experimental techniques, condensed media, nanostructures, surfaces of thin films, and phase boundaries: geometric and energetical structures of surfaces, the methods of computer simulations; physical and chemical properties and their changes upon radiation and other treatments; the methods of studies of films and surface layers of crystals (XRD, XPS, synchrotron radiation, neutron and electron diffraction, electron microscopic, scanning tunneling microscopic, atomic force microscopic studies, and other methods that provide data on the surfaces and thin films). Articles related to the methods and technics of structure studies are the focus of the journal. The journal accepts manuscripts of regular articles and reviews in English or Russian language from authors of all countries. All manuscripts are peer-reviewed.