The effects of ultrasonic vibration on Portevin–Le Chatelier (PLC) effect and stress-strain behavior in aluminum alloy 2024

The effects of ultrasonic vibration on Portevin–Le Chatelier (PLC) effect and stress-strain behavior in aluminum alloy 2024
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超声波振动对铝合金 Portevin-Le Chatelier (PLC) 效应和应力应变行为的影响 2024

DOI:
10.1016/j.scriptamat.2022.115121
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发表时间:
2023
期刊:
影响因子:
6
通讯作者:
Wang, Tianzhao
Wang, Tianzhao
中科院分区:
材料科学1区
文献类型:
--
作者:
Kang, Jiarui;Liu, Xun;Wang, Tianzhao

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通过超声辅助微拉伸试验,研究了超声振动对2024铝合金O态和T4态应力应变行为的影响及Portevin-Le Chatelier(PLC)效应。在两种热处理的流变应力被发现时,施加超声振动降低。在O状态下观察到较高的应力降低百分比和残余软化效应。高速数字图像相关性揭示了两种热处理中增强的PLC带。虽然最初在T4中没有观察到PLC条带,但应用超声后出现了清晰的PLC条带。时空分析表明,在O状态和T4状态下,PLC效应的临界应变在超声振动下降低。此外,在超声振动的条件下观察到更高的应变速率幅度。
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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