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摘要
Electric pulse treatment experiments were carried out on lamellar structure TA15 alloy subsequent to pre-deformation. Then, the morphologies of lamellar structure, dislocation structure and interfacial structure were characterized, and the microstructure evolution mechanisms of pre-deformed TA15 alloy with lamellar structure under the action of electric pulses were analyzed. Results show that electric pulse promotes the atom diffusion and defect reactions in TA15 alloy, and introduces the electricity-induced static globularization. With the increase in current density and energization time, the globularization rate of lamellar structure increases and the average grain size of α lamella first increases and then decreases. Termination migration is regarded as the main mechanism for the earlier stage of α lamella globularization, while boundary splitting and Ostwald ripening dominate in the later stage. Moreover, the main globularization mechanism for β matrix is determined as boundary splitting. The additional interfacial strengthening brought by the globularized α phase leads to a maximum micro-hardness increment of 26.41%. ? 2023 Rare Metals Materials and Engineering Press.
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