High-entropy alloys (HEAs) are a class of metallic materials that have revolutionized alloy design. They are known for their high compressive strengths, often greater than 1 GPa; however, the tensile strengths of most reported HEAs are limited. Here, we report a strategy for the design and fabrication of HEAs that can achieve ultrahigh tensile strengths. The proposed strategy involves the introduction of a high density of hierarchical intragranular nanoprecipitates. To establish the validity of this strategy, we designed and fabricated a bulk Fe₂₅Co₂₅Ni₂₅Al₁₀Ti₁₅ HEA to consist of a principal face-centered cubic (fcc) phase containing hierarchical intragranular nanoprecipitates. Our results show that precipitation strengthening, as one of the main strengthening mechanisms, contributes to a tensile yield strength (σ_0.2) of ~1.86 GPa and an ultimate tensile strength of ~2.52 GPa at room temperature, which heretofore represents the highest strength reported for an HEA with an appreciable failure strain of ~5.2%.

中文翻译：

---

具有分层纳米沉淀和超高强度的高熵合金。

高熵合金（HEA）是一类革新了合金设计的金属材料。它们以高抗压强度（通常大于1 GPa）而著称。但是，大多数报道的HEA的拉伸强度是有限的。在这里，我们报告了可以实现超高拉伸强度的HEA设计和制造策略。提出的策略涉及引入高密度的分级颗粒内纳米沉淀。为了确定该策略的有效性，我们设计并制造了块状Fe ₂₅ Co ₂₅ Ni ₂₅ Al ₁₀ Ti ₁₅HEA由主要的面心立方（fcc）相组成，其中包含分层的颗粒内纳米沉淀。我们的研究结果表明，析出强化，作为主要的强化机制之一，有助于拉伸屈服强度（σ _0.2〜1.86 GPA并在室温下〜2.52 GPA的极限拉伸强度，这迄今为止代表最高强度的）报告的一个HEA，其失效应变约为5.2％。