Effect of electrical pulse on the precipitates and material strength of 2024 aluminum alloy
Effect of electrical pulse on the precipitates and material strength of 2024 aluminum alloy
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DOI：
10.1016/j.msea.2014.04.071
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发表时间：
2014-07
期刊：
影响因子：
6.4
通讯作者：
Weichao Wu;Yongjun Wang;Junbiao Wang;S. Wei
中科院分区：
文献类型：
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作者：
Weichao Wu;Yongjun Wang;Junbiao Wang;S. Wei
采用拉伸试验、硬度测试、透射电子显微镜和差示扫描量热仪等手段，研究了电脉冲对Al-Cu-Mg基2024铝合金亚稳态析出相和材料强度的影响。实验结果表明，电脉冲通过自然时效的2024合金后会产生以材料强度降低和Portevin-Le Chatelier(PLC)效应出现为特征的电脉冲倒退效应。在较高电流密度下，较多的电脉冲在引起电脉冲倒退效应方面更有效。透射电子显微镜和差示扫描量热仪的实验结果表明，2024合金在自然时效过程中，由于亚稳析出相的溶解，产生了电脉冲倒退效应。与传统的在炉中短时间整体加热以降低材料强度的倒退热处理相比，电脉冲倒退效应发生在更低的温度，在室温下脉冲处理的合金能以更快的速度几乎恢复到原始强度。
The effect of electrical pulse on the metastable precipitates and material strength of Al–Cu–Mg based 2024 aluminum alloy was investigated by means of tensile tests, hardness measurement, transmission electron microscopy and differential scanning calorimetry. The experimental results show that the electrical pulse passing through the naturally aged 2024 alloy can cause an electrical pulse retrogression effect which is characterized by the decrease of material strength and the appearance of Portevin–Le Chatelier (PLC) effect. More electrical pulses under higher current densities are more efficient in causing the electrical pulse retrogression effect. TEM and DSC experimental results reveal that, the electrical pulse retrogression effect is owing to the dissolution of the metastable precipitates in naturally aged 2024 alloy. Compared with the traditional retrogression heat treatment that heats the aluminum alloys through bulk heating in furnace for short time to reduce their material strength, the electrical pulse retrogression effect occurs at a much lower temperature and the pulse treated alloy can nearly restore to its original strength at a faster speed at room temperature.