Here we reveal and discuss the relationship among microstructures, textures, and mechanical behaviors of Al_0.1CoCrFeNi high-entropy alloys (HEAs) after cold rolling and annealing. The initially coarsen grains display profuse lamellar-structured slip bands upon cold rolling to 50% reduction with mostly extending vertically to the rolling direction. Meanwhile, cold rolling facilitates the evolutions of Goss ({011} <100>) and Brass ({110} <112>) component textures in the low stacking fault energy (SFE) HEAs accompanying with the formation of deformation twins. Interestingly, the rolling strengthen HEAs exhibit novel anisotropies of yield strength and strain hardening associating more with the direction of the slip lines and twins rather than the rolling-induced preferred orientations, attributing to the easier dislocations glide in between the slip lines and twins than across them. The microstructural characters including dislocation density, slip lines, and twins are quantitatively evaluated, which demonstrates that the dynamic grain refinement contributes much more for the overall strength, compared to the increased dislocation density. A lower strength (370 MPa for yield and 733 MPa for failure) and exceptional ductility (~55%) are achieved in the annealed samples with random grain orientations.

在这里，我们揭示并讨论了Al _0.1的组织，织构和力学行为之间的关系。经过冷轧和退火后的CoCrFeNi高熵合金（HEAs）。最初粗化的晶粒在冷轧时显示出大量的层状滑移带，减少了50％，且大部分垂直于轧制方向延伸。同时，冷轧促进了低堆垛层错能（SFE）HEA中高斯（{011} <100>）和黄铜（{110} <112>）组分织构的演化，并伴随着形变孪晶的形成。有趣的是，滚动强化的HEA表现出新的屈服强度和应变硬化各向异性，其更多地与滑移线和孪晶的方向相关，而不是与滚动诱导的首选方向相关，这归因于滑移线和双胞胎之间的位错更容易滑过他们。微观结构特征包括位错密度，滑移线和孪晶得到了定量评估，这表明与增加的位错密度相比，动态晶粒细化对整体强度的贡献更大。在具有随机晶粒取向的退火样品中，可以获得较低的强度（屈服强度为370 MPa，破坏强度为733 MPa）和出色的延展性（〜55％）。