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<p>A new class of materials, high-entropy alloys, has attracted attention of many researchers because of high mechanical properties. The distinctive features of these materials include: increased entropy, contributing to thermal stability; distortion, as one of the strengthening mechanisms; mixing enthalpy, influencing the interaction between atoms; and cluster structure within the grains, complicating the movement of dislocations and promoting increased strength. Experimental data from instrumented indentation for a large group of high-entropy alloys based on bcc, fcc, and bcc + fcc phases were analyzed, and relationships between the hardness, effective elastic modulus, normalized hardness, elastic strain, elastic limit, distortion, and ratio of hardness to ultimate strength were established. In the studied alloys, the hardness ranged from 2.0 to 8.3 GPa, the elastic modulus from 81 to 233 GPa, and the distortion from 0.82 to 5.89%. The absence of a proportional dependence of hardness and elastic modulus on distortion in solid-solution high-entropy alloys was demonstrated. A proportional dependence of the normalized hardness, ranging from 0.052 to 0.018, and elastic strain on the distortion level for bcc, fcc, and bcc + fcc high-entropy alloys was determined. The elastic limit and yield stress, determined by different methods for bcc, fcc, and bcc + fcc high-entropy alloys, are in good agreement with each other.</p>

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The Effect of Distortion on the Mechanical Properties of High-Entropy Solid-Solution Alloys Determined by Instrumented Indentation

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • V.F. Horban

摘要

A new class of materials, high-entropy alloys, has attracted attention of many researchers because of high mechanical properties. The distinctive features of these materials include: increased entropy, contributing to thermal stability; distortion, as one of the strengthening mechanisms; mixing enthalpy, influencing the interaction between atoms; and cluster structure within the grains, complicating the movement of dislocations and promoting increased strength. Experimental data from instrumented indentation for a large group of high-entropy alloys based on bcc, fcc, and bcc + fcc phases were analyzed, and relationships between the hardness, effective elastic modulus, normalized hardness, elastic strain, elastic limit, distortion, and ratio of hardness to ultimate strength were established. In the studied alloys, the hardness ranged from 2.0 to 8.3 GPa, the elastic modulus from 81 to 233 GPa, and the distortion from 0.82 to 5.89%. The absence of a proportional dependence of hardness and elastic modulus on distortion in solid-solution high-entropy alloys was demonstrated. A proportional dependence of the normalized hardness, ranging from 0.052 to 0.018, and elastic strain on the distortion level for bcc, fcc, and bcc + fcc high-entropy alloys was determined. The elastic limit and yield stress, determined by different methods for bcc, fcc, and bcc + fcc high-entropy alloys, are in good agreement with each other.