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<p>The hot deformation behavior of the widely used additively manufactured aluminum alloy known as AlSi10Mg has been investigated in the present work based on the constitutive analysis. The laser powder bed fusion, also known as selective laser melting, was used to manufacture the samples with the build orientations of 0, 45, and 90°. Hot shear deformation behavior was investigated by the shear punch testing technique. It was revealed that the flow stress was quite dependent on the deformation temperature and strain rate during thermomechanical processing, as investigated by the Zener–Hollomon parameter, while the effect of build orientation was less pronounced. Constitutive analysis revealed that the deformation activation energies were 146.8, 158.2, and 145.9&#xa0;kJ/mol for build orientations of 0, 45, and 90°, respectively. All values were near the lattice diffusion activation energy of Al (142&#xa0;kJ/mol), and the final values of the stress exponents in the power law equation were determined as ~ 4.5 irrespective of the build orientation, denoting that the governing deformation mechanism in all cases was the glide and climb of dislocations in the climb-controlled regime based on the creep theories. The hyperbolic sine law analysis was applied to obtain the final flow stress equation that describes the flow stress over a wide deformation range, solving the problem of power law breakdown. Moreover, a strain-compensated Arrhenius model was developed for modeling and prediction of flow curves, considering flow hardening and flow softening after the peak point, which is probably related to dynamic recrystallization. Finally, the difference between cold and hot working regimes and the effect of build orientation were discussed.</p>

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Constitutive modeling of the hot deformation behavior of additively manufactured AlSi10Mg aluminum alloy

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Mohaddeseh Ramezani,
  • Hamed Mirzadeh,
  • Farzad Khodabakhshi,
  • Reza Mahmudi,
  • Peter Oslanec

摘要

The hot deformation behavior of the widely used additively manufactured aluminum alloy known as AlSi10Mg has been investigated in the present work based on the constitutive analysis. The laser powder bed fusion, also known as selective laser melting, was used to manufacture the samples with the build orientations of 0, 45, and 90°. Hot shear deformation behavior was investigated by the shear punch testing technique. It was revealed that the flow stress was quite dependent on the deformation temperature and strain rate during thermomechanical processing, as investigated by the Zener–Hollomon parameter, while the effect of build orientation was less pronounced. Constitutive analysis revealed that the deformation activation energies were 146.8, 158.2, and 145.9 kJ/mol for build orientations of 0, 45, and 90°, respectively. All values were near the lattice diffusion activation energy of Al (142 kJ/mol), and the final values of the stress exponents in the power law equation were determined as ~ 4.5 irrespective of the build orientation, denoting that the governing deformation mechanism in all cases was the glide and climb of dislocations in the climb-controlled regime based on the creep theories. The hyperbolic sine law analysis was applied to obtain the final flow stress equation that describes the flow stress over a wide deformation range, solving the problem of power law breakdown. Moreover, a strain-compensated Arrhenius model was developed for modeling and prediction of flow curves, considering flow hardening and flow softening after the peak point, which is probably related to dynamic recrystallization. Finally, the difference between cold and hot working regimes and the effect of build orientation were discussed.