Chun-mei Li, Nan-pu Cheng, Zhi-qian Chen, Ning Guo, and Su-min Zeng, Deep-cryogenic-treatment-induced phase transformation in the Al-Zn-Mg-Cu alloy, Int. J. Miner. Metall. Mater., 22(2015), No. 1, pp.68-77. https://dx.doi.org/10.1007/s12613-015-1045-7
Cite this article as: Chun-mei Li, Nan-pu Cheng, Zhi-qian Chen, Ning Guo, and Su-min Zeng, Deep-cryogenic-treatment-induced phase transformation in the Al-Zn-Mg-Cu alloy, Int. J. Miner. Metall. Mater., 22(2015), No. 1, pp.68-77. https://dx.doi.org/10.1007/s12613-015-1045-7

Deep-cryogenic-treatment-induced phase transformation in the Al-Zn-Mg-Cu alloy

Author Affilications
Funds: 

the Fundamental Research Funds for Central Universities of China(No. XDJK2014C008), the National Natural Science Foundation of China(No.51171156), and the Key Scientific and Technoogical Projects of Chongqing(Nos.CSTC2012GGYS5001 and CSTC2013JCYJYS5002).

  • An aluminum alloy (Al-Zn-Mg-Cu) subjected to deep cryogenic treatment (DCT) was systematically investigated. The results show that a DCT-induced phase transformation varies the microstructures and affects the mechanical properties of the Al alloy. Both Guinier-Preston (GP) zones and a metastable η' phase were observed by high-resolution transmission electron microscopy. The phenomenon of the second precipitation of the GP zones in samples subjected to DCT after being aged was observed. The viability of this phase transformation was also demonstrated by first-principles calculations.
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