Abstract The strength-ductility trade-off dilemma is perennially problematic in the materials science community. In particular, the attainability of high tensile strength and large elongation is ambitious in alloys fabricated by powder metallurgy. Here, we demonstrate a powder-metallurgy-based fabrication route to achieve a high synergy of tensile strength and ductility through cold-consolidation of CoCrFeMnNi high-entropy alloy powder using high-pressure torsion followed by annealing. This approach has resulted in an exceptional synergy of high yield strength of 754 MPa with an ultra-high tensile elongation of 58%% which has never been achieved in alloys fabricated by powder metallurgy routes. Additionally, the microstructure can be tuned by annealing treatment to achieve a range of strength and ductility that are highly sought after in industries for a specific application. The present fabrication route can be applied for fabrication of high-entropy alloy-matrix composites using alloys, metals, and ceramic powders to achieve controllable microstructure and eminent tensile properties.

中文翻译：

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一种基于粉末冶金的制造方法，可在高熵合金中实现高抗拉强度和超高延展性

摘要 强度-延展性权衡困境在材料科学界长期存在。特别是，在粉末冶金制造的合金中，高拉伸强度和大伸长率的实现是雄心勃勃的。在这里，我们展示了一种基于粉末冶金的制造路线，通过使用高压扭转和退火对 CoCrFeMnNi 高熵合金粉末进行冷固结来实现抗拉强度和延展性的高度协同作用。这种方法产生了 754 MPa 的高屈服强度和 58%% 的超高拉伸伸长率的特殊协同作用，这在通过粉末冶金工艺制造的合金中从未实现过。此外，微观结构可以通过退火处理进行调整，以获得一系列强度和延展性，这在工业中为特定应用而备受追捧。本制造路线可用于使用合金、金属和陶瓷粉末制造高熵合金基复合材料，以实现可控的微观结构和卓越的拉伸性能。