Composition formula of Al-TMs high-entropy alloys derived by cluster-plus-glue-atoms model and its experimental verification

High-entropy alloys (HEAs) are based on solid solutions which characterized by chemical short-range ordering (CSRO), but there is no accurate structural tool to address CSRO characteristic, obstacles precise composition design for HEAs. In this study, the cluster-plus-glue-atoms model, law of Al-TMs (TMs, transition metals) HEAs with BCC and FCC structures was revealed. structure, five elements in equi-atomic ratio, formula can be expressed a cluster [Al-M14]Al3, non ratio [Al-M14]Al, where M average atom TMs. But both ratios [Al-M12]Al. To confirm effectiveness Al-TMs, two were designed, [Al-Ti4V3Nb4Mo3]Mo [Al-Ti3V3Nb4Mo4]Al. Results show that [Al-Ti3V3Nb4Mo4]Al alloy has higher strength plastic deformation at room temperature. Besides, shows slower soften effect 800 °C, contributed its strength. By substituting Ta some Mo, [Al-Ti3V3Nb4Mo3Ta]Al temperature high drastically decreases, suggesting element deteriorates properties alloys.