Deformation behavior and microstructure of an Al-Zn-Mg-Cu-Zr alloy during hot deformation |
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| Authors: | Liang-ming Yan Jian Shen Jun-peng Li Zhou-bing Li Xiao-dong Yan |
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| Affiliation: | (1) Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha, 410083, China;(2) School of Materials Science and Engineering, Central South University, Changsha, 410083, China;(3) Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang, 422004, China; |
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| Abstract: | The hot deformation behavior and microstructures of Al-7055 commercial alloy were investigated by axisymmetric hot compression at temperatures ranging from 300°C to 450°C and strain rates from 10−2 to 10 s−1, respectively. Microstructures of deformed 7055 alloy were investigated by transmission electron microscopy (TEM). The dependence of peak stress on deformation temperature and strain rate can be expressed by the hyperbolic-sine type equation. The hot deformation activation energy of the alloy is 146 kJ/mol. Moreover, the flow stress curves predicted by the modified constitutive equations are reasonably consistent with the experimental results, which confirms that the proposed deformation constitutive equations can provide evidence for the selection of hot forming parameters. TEM results indicate that dynamic recovery is the main softening mechanism during hot deformation. |
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