Abstract
In this study, direct current-assisted electro-treatment of 7075 aluminum alloys was proposed to manipulate the microstructures and mechanical properties with additional athermal electron wind force. The electro-treatment induced strengthening of the solid-solution-treated alloy due to precipitation hardening at relatively low current densities (1.0–1.7 × 104 A/cm2) for 1 h, yet softening due to precipitate re-dissolution at relatively high current densities (2.0–2.3 × 104 A/cm2). The two-step solid-solution treatment followed by electro-treatment reduced the processing time from 25 h to 2 h, showing a 92 % decrement compared to the conventional T6 (the solid-solution treatment followed by artificial aging) while maintaining comparable micro-hardness.
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