Simultaneous strength–ductility enhancement of a high-entropy alloy via cold rolling and annealing is difficult. Cold rolling and annealing were performed on an as-cast Fe₃₅Co₂₁Ni₆Cr₁₈Mn₂₀ high entropy alloy (HEA), the microstructure showed single phase face centered cubic (fcc) solid solution without phase transformation and the grains were fully recrystallized accompanied by additional grain growth. The grain size decreased significantly from 179.4 ± 15.3 μm to 15.2 ± 1.4 μm. A large number of annealing twins and twin boundaries (TBs) (fraction up to 44.2%) were observed. The dislocation slip and twinning were observed as the dominant plastic deformation mechanism. Meanwhile, dislocations plugging was also seen near the twin boundaries. Tensile tests revealed for the first time that the rolling-annealing HEA overcame the strength-ductility trade-off because the yield strength dramatically increased from 516.7 ± 3.4 MPa to 725.4 ± 4.7 MPa and ductility retained excellent (from 0.51 ± 0.01 to 0.53 ± 0.01) as compared with as-cast HEA, this behavior was attributed to the grain refinement and substantial annealing twins including transgranular annealing twins and suspened annealing twins.

通过冷轧和退火同时提高高熵合金的强度-延展性是困难的。对铸态的Fe ₃₅ Co ₂₁ Ni ₆ Cr ₁₈ Mn ₂₀进行冷轧和退火。高熵合金（HEA），其显微组织显示单相面心立方（fcc）固溶体，没有相变，并且晶粒完全重结晶，并伴随着额外的晶粒生长。晶粒尺寸从179.4±15.3μm显着降低到15.2±1.4μm。观察到大量的退火孪晶和孪晶边界（TB）（分数高达44.2％）。位错滑移和孪晶被认为是主要的塑性变形机制。同时，在双胞胎边界附近也发现了位错堵塞。拉伸测试首次显示出滚动退火HEA克服了强度-延展性的折衷，因为屈服强度从516.7±3.4 MPa急剧增加至725.4±4.7 MPa，并且延展性保持出色（从0.51±0.01到0.53±0 。