Abstract Microstructure and mechanical behavior of a new bcc Al5Nb24Ti40V5Zr26 high-entropy alloy in the as-cast, cold-rolled and recrystallized conditions were studied. In the as-cast condition, the Al5Nb24Ti40V5Zr26 alloy had a single bcc phase coarse-grained (~80 μm) structure. After cold rolling to a total thickness strain 80% the alloy demonstrated typical of deformed metals tensile behavior with a short hardening stage and early necking. Annealing at 800 °C resulted in recrystallization of the matrix and formation of a small fraction of C14 type Laves phase particles. After annealing at 1100 °C, a partial B2 ordering of the matrix phase was found. In the annealed condition, the alloy showed some typical of gum metals features associated with low work hardening and large elongation. The manifestation of a gum-like behavior can be ascribed to the formation of dislocation channels due to the local disordering of the bcc matrix in shear planes. In addition, an unusual (inverse) dependence of yield strength on the recrystallized grain size was observed, most possibly due to a different degree of ordering of the matrix phase.

中文翻译：

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部分有序Al5Nb24Ti40V5Zr26高熵合金的类胶力学行为

摘要 研究了一种新型bcc Al5Nb24Ti40V5Zr26 高熵合金在铸态、冷轧和再结晶条件下的组织和力学行为。在铸态条件下，Al5Nb24Ti40V5Zr26 合金具有单个 bcc 相粗晶 (~80 μm) 结构。在冷轧至总厚度应变为 80% 后，该合金表现出典型的变形金属拉伸行为，具有较短的硬化阶段和早期颈缩。在 800 °C 下退火导致基体再结晶并形成小部分 C14 型 Laves 相颗粒。在 1100 °C 下退火后，发现基体相的部分 B2 有序。在退火条件下，合金表现出一些典型的胶状金属特征，与低加工硬化和大伸长率相关。胶状行为的表现可归因于由于剪切平面中 bcc 基质的局部无序而导致位错通道的形成。此外，观察到屈服强度对再结晶晶粒尺寸的异常（反向）依赖性，很可能是由于基体相的不同程度的有序。