2011•Journal of Central South University(Science and Technology)Requires access

Effect of double-stage aging treatment on microstructure and mechanical properties of Al-Cu-Li-Zr alloy containing Sc

Yunbin He

Abstract

The effect of double-stage aging treatments on the microstructure and mechanical properties of Al-Cu-Li-Zr alloy containing Sc were investigated by using TEM and tensile test at room temperature.The results show that the proper double-stage aging treatment of the alloy is 120 ℃/2 h+160 ℃/24 h,and under this condition,the alloy reaches an optimal combination of the strength-ductility.Double-stage aging makes phase T1 precipitation distribute more dispersively and uniformly in the alloy.Compared with phase T8 peak-aged state,double-stage aging treatment can increase the elongation and remain high level of strength.

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Key concepts: Alloy, Microstructure, Materials science, Ductility (Earth science), Elongation, Metallurgy, Ultimate tensile strength, Phase (matter)