Aging of the Al0.3CoCrFeNi high-entropy alloy single crystals for 50 h at a temperature of 973 K leads to the precipitation of non-coherent non-equiaxed β-phase particles with B2-type ordering, average length l =250–350 nm, width d = 30–45 nm, and interparticle distance L = 500–750 nm. It is shown that the interaction of slip dislocations with β-phase particles is realized by the rounding mechanism. The β-phase particles increase critical shear stresses τcr by 30–50 MPa in the temperature range of 77–973 K compared to the quenched single crystals. The deformation of [$$ \overline{1}11 $$] - and [001]-oriented single crystals in the temperature range of 77–973 K is realized by slip, and τcr are independent of the crystal orientation. It is shown that the strain hardening coefficient Θ = dσ/de and the plasticity epl during tensile strain in [$$ \overline{1}11 $$]- and [001]-oriented single crystals, on the contrary, depend on the crystal orientation. The maximum value of Θ = dσ/de = 3400 MPa and the minimum value of epl = 8% are observed in [$$ \overline{1}11 $$]-oriented single crystals at 77 K. Twinning in [$$ \overline{1}11 $$]- oriented single crystals with the β-phase particles was not detected at tension before failure at 77 and 296 K.

中文翻译：

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非相干β相粒子硬化Al0.3CoCrFeNi高熵合金单晶力学性能的温度和取向依赖性

Al0.3CoCrFeNi 高熵合金单晶在 973 K 的温度下时效 50 h 导致析出非相干非等轴 β 相颗粒，B2 型有序，平均长度 l = 250-350 nm ，宽度 d = 30–45 nm，粒子间距离 L = 500–750 nm。结果表明，滑移位错与β相粒子的相互作用是通过圆整机制实现的。与淬火单晶相比，β 相颗粒在 77-973 K 的温度范围内将临界剪切应力 τcr 增加了 30-50 MPa。[$$ \overline{1}11 $$] - 和 [001] 取向的单晶在 77-973 K 温度范围内的变形是通过滑移实现的，τcr 与晶体取向无关。结果表明，[$$\overline{1}11$$]-和[001]取向的单晶在拉伸应变期间的应变硬化系数 Θ = dσ/de 和塑性 epl 取决于晶体取向。Θ = dσ/de = 3400 MPa 的最大值和 epl = 8% 的最小值在 [$$ \overline{1}11 $$] 取向的单晶中在 77 K 处观察到。孪晶在 [$$ \在 77 和 296 K 下失效之前，在张力下未检测到具有 β 相颗粒的上划线{1}11 $$]-取向单晶。