Phase Equilibria of the Ternary Al-Cu-Zn Alloys on Al-Zn Rich Side |
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| Authors: | Yuhui Zhang Fan Zhang Shuhong Liu Dandan Huang Yong Du |
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| Affiliation: | 1.State Key Laboratory of Powder Metallurgy,Central South University,Changsha,People’s Republic of China;2.School of Materials Science and Engineering,Xiangtan University,Xiangtan,People’s Republic of China;3.Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials,Guangxi University,Nanning,People’s Republic of China |
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| Abstract: | Phase equilibria of the Al-Cu-Zn system on Al-Zn rich side was experimentally determined with 16 alloys annealed at 360 °C. The annealed alloys were examined by means of x-ray diffraction, electron probe microanalysis and differential scanning calorimetry. Five single-phase regions and seven two-phase regions as well as three three-phase regions, i.e. α-(Al)?+?θ-Al2Cu?+?τ′-Al4Cu3Zn, α-(Al)?+?τ′-Al4Cu3Zn?+?ε-CuZn4 and α-(Al)?+?ε-CuZn4?+?(Zn), were determined. The partial isothermal section of the Al-Cu-Zn system on Al-Zn rich side at 360 °C was constructed based on the obtained experimental data in this work. It was observed that the solid solution phase α-(Al) would easily decompose into ε-CuZn4, (Zn) and α′-(Al) at the ambient temperature in the early stages. The ternary phase τ′-Al4Cu3Zn would form and ε-CuZn4 would disappear gradually along with the extension of aging time. |
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