Abstract Welding and relevant studies are indispensable to employ high-entropy alloys for practical applications. In this study, Al0.3CoCrCu0.3FeNi high-entropy alloy with single FCC phase was used to make “bead-on-plate” friction stir welds at different rotational speeds, and the effects on microstructure and mechanical properties were studied. Several banded structures containing oxide or nitride particles were observed in the stir zone (SZ), and the chemical wear of the polycrystalline cubic boron nitride tool was confirmed. The microhardness distribution of the welds showed higher hardness in the SZ because of grain refinement and the presence of deformed grains. The electron backscattered diffraction results suggested that the high-entropy alloy with low stacking-fault energy experienced recrystallization during friction stir welding, which was similar to other conventional materials with low stacking-fault energy.

中文翻译：

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转速对搅拌摩擦焊Al0.3CoCrCu0.3FeNi高熵合金的影响

摘要 焊接和相关研究对于将高熵合金用于实际应用是必不可少的。本研究采用具有单一 FCC 相的 Al0.3CoCrCu0.3FeNi 高熵合金制备不同转速下的“焊珠-板”搅拌摩擦焊缝，研究其对组织和力学性能的影响。在搅拌区 (SZ) 中观察到几个含有氧化物或氮化物颗粒的带状结构，证实了多晶立方氮化硼刀具的化学磨损。由于晶粒细化和变形晶粒的存在，焊缝的显微硬度分布在 SZ 中显示出更高的硬度。电子背散射衍射结果表明低堆垛层错能的高熵合金在搅拌摩擦焊过程中经历了再结晶，