Abstract

Multicomponent alloys without a base element, also known as highly entropic alloys (HEAs), are of great interest for research. The microstructure of the Fe₂₀Ni₂₀Co₂₀Cu₂₀Al₂₀ alloy in a cast, annealed, and deformed state, as well as its mechanical properties and hot deformation ability, is investigated in this article. This alloy is a typical representative of the high-entropy alloy family. Samples are melted in a vacuum induction furnace in an argon atmosphere and then cast into a copper mold. Differential scanning calorimetry results are used to determine the solidus temperature. The homogenization annealing of cast samples is carried out in a high-temperature furnace in air. The microstructure of the alloy is studied by scanning electron microscopy and X-ray diffraction. X-ray microanalysis using X-ray energy dispersive spectroscopy is used to determine the chemical composition of the phases. It is shown that crystallization results in the formation of three solid solutions with one bcc and two fcc crystalline structures. The mechanical properties are investigated under uniaxial compression. Hardness is also measured. The deformation tests are carried out on a DIL805A/D quenching-deformation dilatometer and a Gleeble System 3800 complex for physical modeling and dynamic thermomechanical testing at temperatures of 900–1100°С and strain rates of 0.01–1.0 s^–1 for a true degree of deformation of up to 1. Optimum modes of homogenization annealing for the typical representative of HEAs and optimal deformation modes are selected to obtain high mechanical properties.

中文翻译：

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热力学和热力学过程中高熵合金结构和性能变化的研究

摘要

没有基础元素的多组分合金，也称为高熵合金（HEA），对于研究非常感兴趣。Fe ₂₀ Ni ₂₀ Co ₂₀ Cu ₂₀ Al ₂₀的微观结构本文研究了合金在铸造，退火和变形状态下的力学性能和热变形能力。这种合金是高熵合金家族的典型代表。样品在氩气气氛下的真空感应炉中熔化，然后铸入铜模中。差示扫描量热法的结果用于确定固相线温度。铸件样品的均质退火是在空气中的高温炉中进行的。通过扫描电子显微镜和X射线衍射研究了合金的微观结构。使用X射线能量色散光谱的X射线微分析法可用于确定相的化学成分。结果表明，结晶导致形成具有一个bcc和两个fcc晶体结构的三种固溶体。在单轴压缩下研究机械性能。硬度也被测量。变形测试是在DIL805A / D淬火变形膨胀仪和Gleeble System 3800复合机上进行的，用于在900-1100°С温度和0.01-1.0 s应变速率下进行物理建模和动态热机械测试。^–1表示真实变形程度最高为1。选择用于HEA典型代表的均质退火的最佳模式和最佳变形模式，以获得高机械性能。