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将不同比例的2024商业铝粉和由气雾化法制得的FeNiCrCoAl3高熵合金粉球磨不同时间,然后,将混合粉末通过热挤出方法成型。通过XRD、SEM和TEM方法研究球磨粉和烧结后合金的显微组织,并通过应力测试机测试挤出样品的力学性能。结果表明:球磨后,粉末的晶粒尺寸减小,显微组织发生变化。混合粉末经过48h球磨后,颗粒平均直径约为30 nm;粉末在热挤出后,晶粒尺寸约为70 nm。在适当条件下,热挤出合金的压缩强度达到710 MPa。通过对样品组织和性能关系的分析发现:强度的增加主要归因于纳米α(Al)和FeNiCrCoAl3颗粒以及析出的超细二次相Al6Fe相和富Fe相。
Different proportions of 2024 commercial aluminum powder and the FeNiCrCoAl3 high entropy alloy powder prepared by the gas atomization method were ball milled for different times, and then, the mixed powder was shaped by a hot extrusion method. The microstructures of the ball milled powders and the sintered alloys were investigated by XRD, SEM and TEM. The mechanical properties of the extruded samples were tested by stress testing machine. The results show that after milling, the grain size decreases and the microstructure changes. After 48h milling, the average diameter of the particles was about 30 nm. After the powder was extruded through hot extrusion, the grain size was about 70 nm. Under proper conditions, the compressive strength of the hot-extruded alloy reached 710 MPa. Through the analysis of the relationship between the microstructure and properties of the samples, it is found that the increase of the strength is mainly attributed to the nano-α (Al) and FeNiCrCoAl3 particles, the precipitated ultrafine secondary Al6Fe phase and the Fe-rich phase.