Deep-cryogenic-treatment-induced phase transformation in the Al-Zn-Mg-Cu alloy |
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Affiliation: | School of Materials Science and Engineering, Central South University, Changsha 410083, China |
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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 metastableη′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 transfor-mation was also demonstrated by first-principles calculations. |
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Keywords: | aluminum alloys cryogenic treatment phase transformation microstructure |
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