《Table 2.The calculated parameters based on the XRD data》

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《Effect of pre-recovery on microstructure and properties of rolled Al-12.18Zn-3.31Mg-1.43Cu-0.20Zr-0.04Sr aluminum alloy》

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The hardness and electrical conductivity in the Z direction of the rolled Al-12.18Zn-3.31Mg-1.43Cu-0.20Zr-0.04Sr alloy under different aging processes are listed in Table 3.According to the data in Table 3，the aging process strongly affects the hardness and electrical conductivity of the material.The hardness of the material aged under the T7X-1process is obviously lower than that of the materials aged under the T6 and T7X-2 processes；however，the electrical conductivity is substantially greater than that under the other two aging processes.The hardness is highest for the alloy aged under the T7X-2 process，followed by alloys aged under the T6 and T7X-1 processes.Contrary to the change-in-hardness trend，the electrical conductivity is highest for the sample aged under the T7X-1 process，followed by the samples aged under the T7X-2 and T6 processes.The intergranular corrosion resistance of the aluminum alloy has a certain positive correlation with its electrical conductivity；we therefore speculated that the alloy’s intergranular corrosion resistance would be highest for the sample aged under the T7X-1 process[14-15].Under the same aging process，the hardness and electrical conductivity of the material did not substantially change，which indicates that the pre-recovery heat treatment had little effect on the hardness and electrical conductivity of the material.