Transactions of Materials and Heat Treatment

Title：Study on thermal deformation behavior and constitutive equation of 2195 Al-Li alloy

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ClassificationCode：TG146.2

year,vol(issue):pagenumber：2023,48(9):239-247

Abstract：

Using thermal simulation testing machine Gleeble-3800, the homogenized 2195 Al-Li alloy was subjected to thermal compression deformation at the deformation temperature of 340-500 ℃ and the strain rate of 0.001-10 s-1, the influence of friction on the rheological stress was investigated, the rheological stress constitutive equation was established, and the rheological stress of 2195 Al-Li alloy considering strain compensation and the rheological stress after friction correction were compared and analyzed. The results show that the dendrite segregation in the homogenized 2195 Al-Li alloy is obviously eliminated, the second phase in the grain and at the grain boundary is basically dissolved back into the matrix, and there is a small amount of fishbone Al6(CuFeMn) phase at the grain boundary. The rheological stress after friction correction is smaller than the measured stress, the measured stress values of 2195 Al-Li alloy at different deformation temperatures and strain rates have a good correlation with the predicted values of the rheological stress constitutive equation (correlation coefficient R2=0.97). The predicted values of rheological stress of 2195 Al-Li alloy considering strain compensation is in good agreement with that of rheological stress after friction correction, the correlation coefficient R2 is 0.9913, and the average relative error Δ is 1.60%, indicating that the rheological stress constitutive equations based on friction correction and strain compensation have high accuracy.

Funds：

河南省科技攻关项目(192102310244)；机械工程智能化科研创新团队项目（HNACKT2020-04）

张义俊（1974-），女，博士，副教授 E-mail：yijun7402@sina.com

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