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

Chun-mei Li; Nan-pu Cheng; Zhi-qian Chen; Ning Guo; Su-min Zeng

doi:10.1007/s12613-015-1045-7

Volume 22 Issue 1

Jan. 2015

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International Journal of Minerals, Metallurgy and Materials > 2015 > 22(1): 68-77. > DOI: 10.1007/s12613-015-1045-7

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

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

Chun-mei Li^1,2), ,,
Nan-pu Cheng¹⁾,
Zhi-qian Chen¹⁾,
Ning Guo¹⁾ and
Su-min Zeng¹⁾

Author Affilications

School of Materials Science and Engineering, Central South University, Changsha 410083, China
School of Materials Science and Engineering, Southwest University, Chongqing 400715, China

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).

Received: 22 April 2014; Revised: 11 June 2014; Accepted: 17 June 2014; Available Online: 09 June 2021

Graphical Abstract

Abstract

Abstract

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.
- aluminum alloys,
- cryogenic treatment,
- phase transformation,
- microstructure

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