Tailoring Mechanical and Magnetic Properties in Dual-Phase FeCoNi(CuAl)(0.8) High-Entropy Alloy.
Tailoring Mechanical and Magnetic Properties in Dual-Phase FeCoNi(CuAl)(0.8) High-Entropy Alloy.
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DOI：
10.3390/ma16227222
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发表时间：
2023-11-18
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为了定制双相高熵合金（HEAs）的机械和磁性能，了解每个相对整体性能的影响至关重要。在本文中，单独的FCC和BCC相的机械和磁性能的FeCoNi（CuAl）0.8 HEA的影响进行了研究，通过纳米压痕和第一性原理计算。BCC相的纳米硬度为8.73 GPa，这几乎是FCC相的4.60 GPa的两倍，这归因于仅在BCC相中观察到的球形纳米沉淀物，导致沉淀硬化。电子结构的第一性原理计算表明，BCC相的饱和磁化强度（Ms）为0.81 T，高于FCC相的0.77 T。近似的屈服强度和Ms可以通过求和从每个阶段的体积分数加权贡献估计，并与实验值吻合良好。这表明，双相HEAs的整体机械和磁性能可以通过调节单个相的体积分数来定制。我们的研究结果有助于通过调整各相的含量来设计具有良好力学性能和软磁性能的双相HEAs。
For tailoring the mechanical and magnetic properties of dual-phase high-entropy alloys (HEAs), it is crucial to understand the effect of each phase on the overall properties. In this paper, the effects of individual FCC and BCC phases on the mechanical and magnetic properties of the FeCoNi(CuAl)0.8 HEA are investigated by nanoindentation and first-principles calculations. The nano-hardness of the BCC phase is 8.73 GPa, which is nearly double the 4.60 GPa of the FCC phase, which ascribes to spherical nanoprecipitates that are only observed in the BCC phase leading to precipitation hardening. First-principles calculations on the electronic structure show that calculated saturation magnetization (Ms) of the BCC phase is 0.81 T, higher than 0.77 T of the FCC phase. An approximate yield strength and Ms can be estimated by summing the volume-fraction-weighted contributions from each phase, and are in good agreement with experimental values. It indicates that the overall mechanical and magnetic properties of the dual-phase HEAs can be tailored by tuning the volume fraction of the individual phase. Our findings are helpful to design prospective dual-phase HEAs with both good mechanical properties and soft magnetic performance by adjusting the content of each phase.
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