Phase-field-method-studied mechanism of Cu-rich phase precipitation in Al<sub><i>x</i></sub>CuMnNiFe high-entropy alloy

High-entropy alloys with BCC and FCC coexisting structures usually have excellent comprehensive mechanical properties, Al element can promote the transformation of Cu-containing high-entropy from structure to obtain structures. In order illustrate process phase separation high entropy alloys, a low-cost Al-TM transition group alloy is selected in this work. Based on Chan-Hilliard equation Allen-Cahn equation, three-dimensional field model Al<sub><i>x</i></sub>CuMnNiFe established, microscopic evolution nano-Cu-rich (<i>x</i> = 0.4, 0.5, 0.6, 0.7) at 823 K isothermal aging simulated. The results show that Al<i><sub>x</sub></i>CuMnNiFe generates two complex core-shell upon aging: Cu-rich core/B2<sub>s</sub> shell B2<sub>c</sub> core/FeMn shell, it found through discussion analysis formed plays an inhibitory role formation phase, becomes larger increase element. Combining empirical formula, curve yield strength varying time obtained for alloy, overall has rising-and-then-falling trend change time, peak system are curve, so best provide reference process.