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何立子,魏满想,宁庆波,王新宇,崔建忠.直流电对7B04铝合金固溶与时效组织和性能的影响[J].稀有金属材料与工程(英文),2020,49(6):1957~1962.[Li-zi He,Man-xiang Wei,Qing-bo Ning,Xin-yu Wang and Jian-zhong Cui.Effects of direct current on the microstructures and properties of 7B04 aluminum alloy during solid solution and artificial ageing[J].Rare Metal Materials and Engineering,2020,49(6):1957~1962.]
Effects of direct current on the microstructures and properties of 7B04 aluminum alloy during solid solution and artificial ageing
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Received:March 19, 2019  Revised:May 29, 2019
DOI:
Key words: 7B04 alloy, artificial ageing, electric current, microstructures, properties
Foundation item:National Natural Science Foundation of China (No. 51574076)
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Li-zi He,Man-xiang Wei,Qing-bo Ning,Xin-yu Wang and Jian-zhong Cui  
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Abstract:
      The microstructures and mechanical properties of 7B04 aluminum alloy solid solution at 470oC and aged at 100-140 oC without and with electric current were investigated by tensile test, scanning electron microscope (SEM) and transmission electron microscope (TEM). Compared with the traditional T6 treatment (470 oC/30min+120 oC/24h), applying electric current of 500A during solid solution and/or ageing treatment can increase both the tensile strengths and elongation at the age-peak state, due to the significant increase of the precipitation density of Guinier- Preston II (GPII) zones. Applying electric current during solid solution can significantly reduce the time to the peak strength by 12h in the subsequent ageing alloy