化学复杂合金中分布型层错能量学的证据及其对变形的影响
Evidence for Distributed Fault Energetics and Their Impact on Deformation in a Chemically Complex Alloy
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中文总结 AI 辅助
本研究提出基于分布的框架，将实验堆垛层错宽度与表观层错能量关联，揭示CrCoNi中分布型能量景观及其对变形机制的影响，为理解化学复杂合金变形提供实验锚定方法。
中文摘要 AI 辅助
化学复杂合金具有内在异质的局部化学环境，因此局部层错能量存在涨落。然而，通过实验量化它们之间的关系仍然具有挑战性，使得这种分布能量景观在变形机制中的作用尚未完全解决。在此，我们开发了一个基于分布的框架，将实验测量的堆垛层错宽度与变形相关的表观层错能量联系起来，揭示了CrCoNi中分布型的局部层错能量景观。该框架揭示了能量涨落的稳定作用，并捕捉到表观层错能量在热处理后从负值向零的上移，原子模拟将此与L12型化学短程有序的出现相关联。通过一维动力学蒙特卡洛模拟，并辅以电子显微镜观察，我们进一步表明，局部层错能量景观的历史依赖变化偏向于CrCoNi中堆垛层错、纳米孪晶和HCP相变之间的竞争。我们的结果提供了一个实验锚定的、基于分布的框架，用于理解化学复杂合金在由局部化学有序塑造的分布型层错能量景观中的变形演化。
英文摘要
Chemically complex alloys feature intrinsically heterogeneous local chemical environments and, consequently, fluctuations in local fault energetics. However, experimentally quantifying their relationship remains challenging, leaving the role of this distributed energy landscape in deformation mechanisms incompletely resolved. Here, we develop a distribution based framework linking experimentally measured stacking fault widths to deformation relevant apparent fault energy, revealing a distributed local fault-energy landscape in CrCoNi. The framework reveals the stabilizing role of energy fluctuations and captures an upward shift in the apparent fault energetics, from negative values toward zero following heat treatment, which atomistic simulations associate with the emergence of L12 type chemical short-range order. Using one-dimensional kinetic Monte Carlo simulations, supported by electron microscopy observations, we further show that history-dependent changes in the local fault-energy landscape bias the competition among stacking faulting, nano-twinning and HCP transformation in CrCoNi. Our results provide an experimentally anchored, distribution-based framework for understanding deformation in chemically complex alloys as it evolves within a distributed fault-energy landscape shaped by local chemical order.
发表机构
- University of Illinois at Urbana-Champaign（伊利诺伊大学厄巴纳-香槟分校）
- The University of Osaka（大阪大学）
- Shanghai University（上海大学）
- Oak Ridge National Laboratory（橡树岭国家实验室）
- Argonne National Laboratory（阿贡国家实验室）
- University of Tennessee, Knoxville（田纳西大学诺克斯维尔分校）
- Monash University（蒙纳士大学）
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