To enhance strain hardening of alloys beyond levels accessible by forest hardening slip-twin interactions and twin-twin interactions have been proposed. The high entropy alloy FeMnNiCoCr constitutes a prominent example of exceptionally pronounced strain hardening instigated by profuse slip-twin/twin-slip and twin-twin interaction at cryogenic temperatures. In the current study, we perform uniaxial straining experiments on single crystals at 77 K. The <144>_Tension crystal shows the potential ease of twin progression for slip-twin interaction (softening) in contrast to the difficulty for twin advancement in <122>_Tension, <111>_Tension and <001>_Compression cases (hardening). The corresponding self and latent hardening coefficients derived from the data reveal that slip-twin latent moduli are much smaller than twin-twin latent moduli. Unlike previous undertakings, this study demonstrates a novel approach to assess latent hardening where plastic straining is implemented in a monotonic fashion and primary and latent systems operate simultaneously. To predict the flow stress depending on crystal orientation and as a function of strain a numerical model is proposed using the obtained hardening moduli. It emerges that the magnitude of residual Burgers vectors originating from twin-related reactions can explain the experimental hardening/softening trends. These results hold considerable promise for a quantitative description of strain hardening in metals and alloys.

为了增强合金的应变硬化，使其超过森林硬化可达到的滑动-孪生相互作用和孪生-孪生相互作用的水平。高熵合金FeMnNiCoCr构成了显着的应变硬化的显着示例，该应变硬化是由低温下的大量孪晶-孪晶/孪晶-玻壳和孪生双晶相互作用引起的。在当前的研究中，我们在77 K的单晶上进行单轴应变实验。<144>_张力晶体显示了孪晶相互作用（变软）的潜在孪生进展容易性，而<122>中的孪生进展困难_张力，<111>_张力和<001>_压缩情况（硬化）。从数据得出的相应的自我和潜在硬化系数表明，滑动孪生潜模量远小于孪生孪生潜模量。与以前的工作不同，本研究展示了一种评估潜在硬化的新颖方法，其中以单调方式施加塑性应变，并且主要系统和潜在系统同时运行。为了预测取决于晶体取向以及作为应变的函数的流动应力，提出了一种使用获得的硬化模量的数值模型。结果表明，源自双胞胎相关反应的剩余Burgers向量的大小可以解释实验性的硬化/软化趋势。这些结果为定量描述金属和合金中的应变硬化提供了巨大的希望。