Li Hui, Wang Han, Bai Xiaoyu, Yan Peng, Liu Linxiang, Wang Chuwen, Qiu Yunji, Wang Zhijun
School of Materials Science and Engineering, Chang'an University, Xi'an 710064, China.
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China.
Materials (Basel). 2025 May 23;18(11):2454. doi: 10.3390/ma18112454.
Recrystallization is a critical process for tailoring the microstructure to enhance the mechanical properties of alloys. In duplex-phase alloys, the recrystallization is different due to the influence of the second phase. Hypo-eutectic high-entropy alloys (HEAs) with two phases are promising structural materials. Understanding the laws of microstructure and mechanical properties during recrystallization is essential for fabrication and application. Here, we systematically investigate the influence of recrystallization time on the microstructure and mechanical properties of an as-cast hypo-eutectic high-entropy alloy (HEA), AlNiCrFeMo. As the recrystallization time increases from 10 min to 8 h at 1100 °C, the cold-rolled alloy gradually completed the recrystallization process with a residual large B2 phase and equiaxed FCC grains decorated with B2 precipitation. The average grain size of the FCC phase increases slightly from 2.60 μm to 3.62 μm, while the fine B2 phase precipitates along the FCC phase's grain boundaries. This optimized microstructure significantly improves the alloy's tensile strength from 422 MPa to 877 MPa, while maintaining a substantial plasticity of 41%, achieving an excellent strength-ductility balance. These findings provide useful information for regulating the industrial thermomechanical treatment of dual-phase hypo-eutectic high-entropy alloys.
再结晶是调整微观结构以提高合金力学性能的关键过程。在双相合金中，由于第二相的影响，再结晶过程有所不同。具有两相的亚共晶高熵合金（HEAs）是很有前途的结构材料。了解再结晶过程中的微观结构和力学性能规律对于其制造和应用至关重要。在此，我们系统地研究了再结晶时间对铸态亚共晶高熵合金AlNiCrFeMo的微观结构和力学性能的影响。在1100°C下，随着再结晶时间从10分钟增加到8小时，冷轧合金逐渐完成再结晶过程，残余大量B2相，等轴FCC晶粒上分布着B2析出物。FCC相的平均晶粒尺寸从2.60μm略有增加到3.62μm，而细小的B2相沿FCC相的晶界析出。这种优化的微观结构显著提高了合金的抗拉强度，从422MPa提高到877MPa，同时保持了41%的较大塑性，实现了优异的强度-塑性平衡。这些发现为调控双相亚共晶高熵合金的工业热机械处理提供了有用信息。
