Microstructure, phase stability, and mechanical properties of Al-Li-Mg-Ti-M (M=Zn, Zr, V) lightweight high-entropy alloys

作者：Quan Dong, Meng Li, Yufei Zhang, Jing Zhang · 发表于：Transactions of Nonferrous Metals Society of China · 年份：2025 · DOI：10.1016/s1003-6326(25)66780-x · 被引用次数：4 · 研究领域：High Entropy Alloys Studies、High-Temperature Coating Behaviors、Additive Manufacturing Materials and Processes

The microstructural evolution, phase stability, and mechanical properties of Al-Li-Mg-Ti-M (M=Zn, Zr, V) lightweight high-entropy alloys (LW-HEAs) were investigated. The LW-HEAs with three components, Al 20 Li 20 Mg 10 -Ti 40 Zn 10 (#Zn), Al 20 Li 20 Mg 10 Ti 30 Zr 20 (#Zr), and Al 20 Li 20 Mg 10 Ti 30 V 20 (#V), were designed according to the thermo-dynamic design criteria of HEA, and prepared via a combination process of mechanical alloying and cold-press sintering. The effects of alloy composition and sintering temperature on the microstructure and mechanical properties of the LW-HEAs were studied. The results show that the as-milled Al-Li-Mg-Ti-M (M=Zn, Zr, V) LW-HEAs form a simple structure with HCP-type solid solution as the primary phase, a dual-HCP type solid solution phase, and a BCC phase, respectively. After cold-press sintering, the #Zn and #V alloys undergo obvious phase transformation; while the #Zr alloy with dual-HCP phases exhibits the best phase stability during heat treatment. The #V-750 °C alloy demonstrates the maximum hardness and specific strength of HV 595.2 and 625 MPa∙cm 3 /g, respectively, under the combined effect of solid solution strengthening of BCC phase and precipitation strengthening of β -AlTi 3 . Moreover, the #Zr-650 °C, #Zr-750 °C, and #Zn-650 °C alloys are expected to have excellent plasticity.