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Effect of aging processes on microstructure and properties of Al-Zn-Cu-Mg-Sc-Zr alloy

Xiaoyan Liu

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Abstract

Effects of single aging,duplex aging and retrogression and reaging(RRA) treatments on microstructure and mechanical properties of the Al-Zn-Cu-Mg-Zr alloy containing Sc were studied by means of transmission electron microscopy,tensile test and conductivity measurement.The results show that after duplex aging of 120 ℃×8 h+160 ℃×16 h,strength of the alloy decreases sharply and its conductivity rises quickly,and grains of the alloy becomes coarse obviously,and the precipitates at grain boundary grow up with discontinuous distribution.The alloy maintains the strength level of T6 and a high conductivity value after the RRA treatment,which is pre-aging at 120 ℃ for 24 h,retrogression at 180 ℃ for 30 min and re-aging at 120 ℃ for 24 h.The precipitates in grains are similar to those after T6 temper and the grain boundary precipitates are similar to those of over-aged condition for the alloy after the RRA treatment.

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What this paper is about

Effects of single aging,duplex aging and retrogression and reaging(RRA) treatments on microstructure and mechanical properties of the Al-Zn-Cu-Mg-Zr alloy containing Sc were studied by means of transmission electron microscopy,tensile test and conductivity measurement.The results show that after duplex aging of 120 ℃×8 h+160 ℃×16 h,strength of the alloy decreases sharply and its conductivity rises quickly,and grains of the alloy becomes coarse obviously,and the precipitates at grain boundary grow up with discontinuous distribution.The alloy maintains the strength level of T6 and a high conductivity value after the RRA treatment,which is pre-aging at 120 ℃ for 24 h,retrogression at 180 ℃ for 30 min and re-aging at 120 ℃ for 24 h.The precipitates in grains are similar to those after T6 temper and the grain boundary precipitates are similar to those of over-aged condition for the alloy after the RRA treatment.

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Available abstract

Effects of single aging,duplex aging and retrogression and reaging(RRA) treatments on microstructure and mechanical properties of the Al-Zn-Cu-Mg-Zr alloy containing Sc were studied by means of transmission electron microscopy,tensile test and conductivity measurement.The results show that after duplex aging of 120 ℃×8 h+160 ℃×16 h,strength of the alloy decreases sharply and its conductivity rises quickly,and grains of the alloy becomes coarse obviously,and the precipitates at grain boundary grow up with discontinuous distribution.The alloy maintains the strength level of T6 and a high conductivity value after the RRA treatment,which is pre-aging at 120 ℃ for 24 h,retrogression at 180 ℃ for 30 min and re-aging at 120 ℃ for 24 h.The precipitates in grains are similar to those after T6 temper and the grain boundary precipitates are similar to those of over-aged condition for the alloy after the RRA treatment.

Key concepts: Alloy, Materials science, Microstructure, Grain boundary, Conductivity, Ultimate tensile strength, Transmission electron microscopy, Metallurgy

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