Journal
SCRIPTA MATERIALIA
Volume 224, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.115121
Keywords
Aluminum alloy; Portevin -Le Chatelier effect; Digital image correlation; Ultrasonic softening; Dynamic strain aging
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The effect of ultrasonic vibration on the stress-strain behavior and the Portevin-Le Chatelier (PLC) effect in aluminum alloy 2024 O temper and T4 were investigated. The results show that ultrasonic vibration can decrease the flow stress and enhance the PLC bands in both heat treatments.
The effect of ultrasonic vibration on the stress-strain behavior and the Portevin-Le Chatelier (PLC) effect in aluminum alloy 2024 O temper and T4 were investigated based on ultrasonically assisted micro-tensile tests. Flow stress in both heat treatments was found to be decreasing when ultrasonic vibration is applied. A higher percentage of stress reduction and the residual softening effect was observed in O temper. High-speed digital image correlation reveals the enhanced PLC bands in both heat treatments. While no PLC band was observed in T4 originally, clear PLC bands appear with applied ultrasound. Spatio-temporal analysis revealed that in both O temper and T4 conditions, the critical strain of the PLC effect decreases under ultrasonic vibration. In addition, a higher strain rate magnitude was observed in conditions with ultrasonic vibration.
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