A strategy to improve the tensile properties of Co_17.5Cr_12.5Fe₅₅Ni₁₀Mo₅ (at%) medium-entropy alloy through high-pressure torsion and subsequent annealing is presented in this work. Microstructural study revealed that the high-pressure torsion process led to the formation of fine grains (≤~1 μm) and profuse nano-scale Mo-rich μ-phase precipitates. And resultantly, the yield strength of the alloy was tuned from ~400 MPa to ~1 GPa, while preserving reasonable uniform elongation over 15%. The combination of strengthening from grain refinement and precipitation contributed to the excellent strength, while the post-HPT annealing provided substantial ductility.

本文提出了一种通过高压扭转和随后的退火处理来改善Co _17.5 Cr _12.5 Fe ₅₅ Ni ₁₀ Mo ₅（at％）中熵合金的拉伸性能的策略。微观结构研究表明，高压扭转过程导致了细晶粒（≤〜1μm）的形成，并形成了纳米级富钼的μ相沉淀物。结果，合金的屈服强度从〜400 MPa调整到〜1 GPa，同时保持了15％以上的合理均匀伸长率。晶粒细化和析出的强化相结合，提供了出色的强度，而HPT后的退火则提供了显着的延展性。