High/medium-entropy alloys (H/MEAs) are regarded as a potentially viable alternative to conventional metallic fibers for the production of ductile, high-strength fibers, to resolve the inherent trade-off between strength and ductility. The present study involved the cold drawing technique to produce a CoNiV MEA fiber measuring 300 μm in diameter with a length of more than 3 m. The mechanical properties of the FCC matrix can be improved through the inclusion of an appropriate amount of the κ phase via the optimized thermal treatment process. In addition to a yield strength of 1681 MPa and a well-coordinated elongation of 13.4 %, the ideal CoNiV fiber demonstrated a substantial ultimate tensile strength of 1932 MPa. Further calculations revealed that the κ phase, which possesses a substantial Von Mises stress of approximately 2715 MPa and an area fraction of 18.2 ± 1.1 %, was observed to be a primary contributor to the strength. Deformation twins were generated in the FCC matrix as a result of the ultra-high flow stress, which provided adequate ductility. This study offers significant contributions to the understanding of the deformation mechanisms and strengthening effect of the κ phase, thereby facilitating the development of high-performance metallic fibers.

中文翻译：

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CoNiV中熵合金纤维的塑性变形与强化机制

高/中熵合金（H/MEA）被认为是传统金属纤维的潜在可行替代品，用于生产延展性高强度纤维，以解决强度和延展性之间固有的权衡问题。本研究采用冷拉技术生产直径为 300 μm、长度超过 3 m 的 CoNiV MEA 光纤。通过优化的热处理工艺，加入适量的κ相可以提高FCC基体的机械性能。除了 1681 MPa 的屈服强度和 13.4% 的协调一致的伸长率之外，理想的 CoNiV 纤维还表现出 1932 MPa 的极限拉伸强度。进一步的计算表明，κ 相具有约 2715 MPa 的较大 Von Mises 应力和 18.2 ± 1.1 % 的面积分数，被认为是强度的主要贡献者。由于超高流变应力，FCC 基体中产生了变形孪晶，从而提供了足够的延展性。这项研究为理解κ相的变形机制和强化效应做出了重大贡献，从而促进了高性能金属纤维的开发。