【摘要】 研究了冷轧、退火和时效对Fe₅₀Ni₂₅Cr₁₅Al₁₀高熵合金组织和力学性能的影响。结果表明，铸态Fe₅₀Ni₂₅Cr₁₅Al₁₀高熵合金为FCC+B2双相结构。冷轧、退火和时效后，FCC相由树枝晶转变为等轴晶，并产生占比约为43.7%的退火孪晶，平均晶粒尺寸从228.84μm细化到4.51μm。B2相呈现出两种析出方式，分别是沿晶析出的链状大尺寸相和晶内弥散分布的小尺寸椭球形相，并且B2相占比从0.9%提升至13.3%。结构的调控使合金的屈服强度和抗拉强度分别由铸态的254 MPa和528 MPa提高到466 MPa和760 MPa,断裂总延伸率为31.5%,具有良好的强塑性匹配。更多还原

【Abstract】 Effects of cold rolling, annealing and aging on the microstructure and mechanical properties of the Fe₅₀Ni₂₅Cr₁₅Al₁₀ high entropy alloy were investigated. The results show that the as-cast Fe₅₀Ni₂₅Cr₁₅Al₁₀ high entropy alloy has FCC+B2 bi-phase structure. After cold rolling, annealing and aging, the FCC phase is transformed from dendrite to equiaxial grains, the annealing twins accounting for 43.7% are produced, and the average grain size is refined from 228.84 μm to 4.51 μm. The B2 phase exhibits two precipitation modes, namely chain like large-sized intergranular precipitated phase and small-sized ellipsoidal phase dispersing inside the grains, and the proportion of B2 phase increases from 0.9% to 13.3%. The yield strength and tensile strength of the high entropy alloy are increased from 254 MPa and 528 MPa to 466 MPa and 760 MPa, respectively, and the percentage total extension at fracture is 31.5%, showing good strength-plasticity matching.更多还原