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Fatigue resistance of nanotwinned high-entropy alloy films

机译：纳米孪晶高熵合金薄膜的抗疲劳性

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Nanotwinned nanocrystalline CoCrFeNi high-entropy alloy films were prepared by magnetron sputtering. A disordered face-centered cubic structure was identified, with a uniform distribution of chemical elements. Both 1 1 0 out-of-plane and 1 1 1 in-plane textures were also observed in the nanotwinned film with a thickness of 2.98 mu m. The fatigue resistance of the films was analyzed by nanoindentation technique with up to 103 cycles under various impact energies, complemented by post-test atomic force microscopy investigation of indentation craters. Unlike coarse-grained samples, the nanotwinned films exhibited excellent fatigue resistance, characterized by history-independent and near-stable fatigue responses. Under the influence of the textures developed in the films, the nanotwin planes were oriented toward the loading direction under each fatigue cycle. As such, extremely stable correlated necklace dislocations structure formed and moved back and forth along the twin boundaries during cyclic loading, which preserved the slip systems as well as the coherency and stability of twin boundaries.
机译：通过磁控溅射制备了纳米孪晶的CoCrFeNi纳米晶高熵合金薄膜。确定了无序的以面心为中心的立方结构，化学元素分布均匀。在厚度为2.98μm的纳米孪生薄膜中，还观察到<1 1 0>面外和<1 1 1>面内纹理。通过纳米压痕技术在各种冲击能量下最多可进行103个循环，分析了薄膜的抗疲劳性，并辅以对压痕坑的测试后原子力显微镜研究。与粗颗粒样品不同，纳米孪晶膜表现出出色的抗疲劳性，其特征在于独立于历史且接近稳定的疲劳响应。在薄膜中形成的织构的影响下，在每个疲劳循环下，纳米孪晶面都朝向加载方向取向。这样，在循环加载过程中，形成了极其稳定的相关项链位错结构，并沿孪生边界来回运动，从而保留了滑移系统以及孪生边界的连贯性和稳定性。

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