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Through microstructure observation and X-ray diffraction analysis, the equilibrium phase constituents of Al-Zn alloythat contains 2 at. pct Cu at room temperature have been determined as Al-based solid solution (α), Zn-based solidsolution and Al_4Cu_3Zn phase (T’-phase), which are different from α phase, Zn phase and CuZn_4 phase originallybelieved. It is determined that the products of discontinuous precipitation transformation below 277℃ are not theequilibrium phase constituents, but the metastable phases made up of a phase, Zn phase and CuZn_4 phase. Thephase constituents after discontinuous precipitation of AlZn-2Cu alloy would transform to the ones in equilibriumstatus: Al-based solid solution (α) in fcc structure, Zn-based solid solution in hcp structure and Al_4Cu_3Zn phase(T’-phase) ultimately through plastic deformation at room temperature and re-heating treatment below 277℃.
Through microstructure observation and X-ray diffraction analysis, the equilibrium phase constituents of Al-Zn alloy containing 2 at. Pct Cu at room temperature have been determined as Al-based solid solution (α), Zn-based solidsolution and Al_4Cu_3Zn phase (T It is determined that the products of discontinuous precipitation transformation below 277 ° C are not the equilibrium phase constituents, but the metastable phases made up of a phase, Zn phase and CuZn_4 phase. Thephase constituents after discontinuous precipitation of AlZn-2Cu alloy would transform to the ones in equilibrium state: Al-based solid solution (α) in fcc structure, Zn-based solid solution in hcp structure and Al_4Cu_3Zn phase (T’-phase ) ultimately through plastic deformation at room temperature and re-heating treatment below 277 ° C.