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Acta Metall Sin  2014, Vol. 50 Issue (6): 685-690    DOI: 10.3724/SP.J.1037.2013.00733
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STRENGTHENING EFFECTS OF MICROSTRUCTURE EVOLUTION DURING EARLY AGEING PROCESS IN Al-Mg-Si ALLOY
WANG Bo, WANG Xiaojiao, SONG Hui, YAN Jujie, QIU Tao, LIU Wenqing, LI Hui
Key Laboratory for Microstructures, Shanghai University, Shanghai 200444
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Abstract  The microstructure evolution, atomic ratio (r) of Mg and Si in different precipitates, and precipitation strengthening effects during the ageing process were investigated by HRTEM, atom probe tomography (APT) and hardness testing in LT24 aluminum alloy used for nuclear fuel cladding alternative materials. The results show that the early stage of ageing at 180 ℃ led to a significantly increasing of hardness and the formation of high density of solute clusters and Guinier-Preston (GP) zones in the alloy. The alloy reaches peak hardness after ageing at 180 ℃ for 4 h due to a significant increasing density of the precipitates. After the peak hardness, a hardness plateau is maintained for longer ageing time, because of the precipitate is still the main strengthening phase in the specimens. The precipitates grow larger and the r increases with the increasing of ageing time. The r in needles changes from 1.23 to 1.35. needles are the main precipitation strengthening phase of the alloy. The precipitation sequence during the early ageing treatment in alloy can be described as follows: supersaturated solid solution →solute atom clusters→solute atom clusters+GP zone→solute atom clusters+GP zone+.
Key words:  aluminium alloy      solute atom cluster      nanoprecipitation      precipitation strengthening      atom probe tomography     
Received:  14 November 2013     
ZTFLH:  TG146.21  
Fund: Supported by National Natural Science Foundation of China (No.51301103), China Postdoctoral Science Foundation (No.2013M541507), Key Project of Shanghai Science and Techology Commission (No.12JC1404000) and Innovation Fund of Shanghai University
Corresponding Authors:  LI Hui, assistant professor, Tel: 18017086586, E-mail: huili@shu.edu.cn   

Cite this article: 

WANG Bo, WANG Xiaojiao, SONG Hui, YAN Jujie, QIU Tao, LIU Wenqing, LI Hui. STRENGTHENING EFFECTS OF MICROSTRUCTURE EVOLUTION DURING EARLY AGEING PROCESS IN Al-Mg-Si ALLOY. Acta Metall Sin, 2014, 50(6): 685-690.

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00733     OR     https://www.ams.org.cn/EN/Y2014/V50/I6/685

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